Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2d57100ae69910…

MALICIOUS

PDF

42.8 KB Created: 2020-10-30 00:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b7498991fd809b374936eac3d261051f SHA-1: 98df7113587eca0190e864c67b2cd4d85e92a956 SHA-256: 3e2d57100ae69910495aaf3c9ec4802845e7511bbff0efa2a56a258d78f6745d
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed it contains a large number of embedded links, many pointing to disposable hosting, and one specific URL identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a link farm strategy, likely intended to drive traffic to malicious sites or engage in SEO spam.

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.club/pify?keyword=south+carolina+climate+change+map In PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/lavujigexoxobi_zutekemu_vitumibifexeg.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/9f71eaa.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/a4293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f8941955002e.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/zerovawegoselededu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8b214772da1.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/5963702.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/0d9348d73889d98.pdfIn PDF document text
    • https://solusolifodijal.weebly.com/uploads/1/3/4/4/134433047/rasejunabaja-pasolufom-lamesegafuxal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4373/4182/files/74452632645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8766/8409/files/ejercicios_resueltos_de_ecuacion_cuadratica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3661f75-a16c-45a6-a822-29faa8f4a65c/knox_county_maine_coronavirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618088a6-09a3-456d-9c1d-982806cd2524/swtor_kira_romance_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c935c7b-3961-49b6-9d56-32b8f80614dc/39699767732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8350561-54ba-4686-9d22-fe760f8e95d3/new_free_trial_chat.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6905 5272 bytes
SHA-256: d160e5db878be9b01adee4ce50b7760ba44c2dc41266ac84518a69db88fcf881
font_01_sfnt_off00007ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 10408 bytes
SHA-256: 1b54c6d835ea6b2cd5149351191161064171ae4503ef286c227cb788d90ed32a

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