Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fadd576a8da468…

MALICIOUS

PDF

43.0 KB Created: 2020-11-05 11:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d54fcd6da396099ce4f23878437ae0a6 SHA-1: 8347ff7aedba3d54efdb37bb096144ffbfe4b800 SHA-256: f4fadd576a8da4681bbf778d802d084f4d286c635cfe77128bdd085dd0c904de
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.link/123?keyword=ib+written+assignment+example. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The ML classifier also strongly flagged this PDF as malicious. The document body contains a URL that matches the redirector link, suggesting an attempt to lure the user into clicking it.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/123?keyword=ib+written+assignment+example In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5fa022548f4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f9dfce6279e4.pdfIn PDF document text
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/4691411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f99dc59e057d.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/1596414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5f95159d022b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f91871b0b0e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takateg/jump_condition_heat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3c2db6-42de-48a9-83f8-804029b4f8ae/belutufotarapusudara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8558daf-990b-4fad-ad91-da444bbeddab/58550644769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d309862e-7351-4001-82f1-c89795b216de/megajejifomefuragir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a86ba67-1337-49a0-a6e2-525a00862672/vokomididazomole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f402f5-3ed4-4130-83a7-d90c4d855e44/skyrim_devious_devices_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e318e7b2-17c6-4408-9b6c-60773007bb7f/jogiliburazofusidu.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/vokatakolifedewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b28114-dbaa-4bb0-b52d-27b43a67d06c/foxojevo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D23 5376 bytes
SHA-256: 330ad6365f980d4f53b2264a17b7ced42436f21d8499bedb6b328ec11a1f69c1
font_01_sfnt_off00005f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 9200 bytes
SHA-256: c37c60586aa83212e9cc07e1b4533d8bd31e315b361169acf779c35e8cb2606c
font_02_sfnt_off00007f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F14 19768 bytes
SHA-256: e38fa86f50500ef19fecbc9a74f0829733a4ba470fc7cb5caa19fff1edac8d69

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