Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c16bb8cc5fd38a…

MALICIOUS

PDF

42.1 KB Created: 2020-10-25 21:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ce12ffb8dee64879545433959e1da7e5 SHA-1: 10cba02af4272c95d089fcba60eccddb1d2543a4 SHA-256: b8c16bb8cc5fd38ae882ad1f59b45882dda809286db2ceea9fc08d3d2f327e01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to numerous external websites, including a known malicious redirector at 'https://ttraff.ru/123?keyword=encyclopedia+of+positive+psychology+pdf'. The document's content and structure suggest an attempt to manipulate search engine rankings or to distribute malicious links under the guise of legitimate content. The ML classifier strongly indicated maliciousness, supporting the presence of these link farming and redirector tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/123?keyword=encyclopedia+of+positive+psychology+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f94993f065b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f8b1ac5a891a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f8dc63305fe0.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/furuletuguwuv-xizelevid-kekilojan-fereti.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/waruv.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/dda9c8fd3171e0.pdfIn PDF document text
    • https://gefedotozowane.weebly.com/uploads/1/3/4/3/134395864/xipudez.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/neteworo_mojuje_bulatitiv_nemoredojulugoj.pdfIn PDF document text
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/1e7ecc33e5624a.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vidabudivodeduwokobu.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/961a7a8cf7d312b.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/jopotudivuge-pimatimax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/b590fded-98eb-44bb-bacb-a650bc07995f/7728910686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6d1c75-4f02-4909-9c32-21844a984134/pomodifalugogujuvedip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dbe1df-1487-4da2-9dee-7d78637cb6cb/doboxatogaxoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0bc4f-1575-4cc4-8629-6f689ffd09d4/rufapumebodinefakoluboki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082d478b-f8c3-45a6-9bf8-d2a77ee727d6/pidududigawemisososolowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12639ac8-3ae7-45cb-b6d1-9fba5be91075/92150123923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5481f164-bfce-4a2d-8d1f-ca114835111c/zebisokozurinifilazutixal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe06f7e-d388-46ec-af16-569b64dbde2f/1062884065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac4a84b-ee5c-42ce-871c-2e43df608b83/61464712934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7437a55-01f9-4774-9238-4d6e0bdce202/10842480985.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000556a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x556A 5440 bytes
SHA-256: 36796ab98e77f9a0025b1e610d68de37b7eac818944db1325e752268bef8173a
font_01_sfnt_off000067ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67EF 6212 bytes
SHA-256: 610251af52a104913c7cf85374511bfd930e5a78b5c7b6df033344a33a2ec952
font_02_sfnt_off00007823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 10064 bytes
SHA-256: 91a37a833185d9d275e6939aad143e7f793a82a5f1ab216a180e5631229273d2

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