Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ad15746d102a0a…

MALICIOUS

PDF

50.9 KB Created: 2020-11-08 05:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 337f8d6a7be7074ac5e51fb67607bdc8 SHA-1: 594d01d1491c7b78ccc7c5ab864cb8c508b45b55 SHA-256: 65ad15746d102a0ae96bfc615b9306825a9ee8ade30daf83469b4422d3b51606
124 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, one of which, https://traffine.ru/123?keyword=lesson+2.4+deductive+reasoning+answer+key, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into visiting malicious infrastructure. The presence of multiple links and the ML classifier's high confidence further support its malicious nature.

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 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://traffine.ru/123?keyword=lesson+2.4+deductive+reasoning+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f8acd09551d3.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/c9ea82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5f95572c85543.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/2b41c7a99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9f3eeb47179.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/2152693.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/melopon_misuvu_bibivi_dekedudogadoj.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/dunijojivisilezuw.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/wamejuram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f87b72c3765a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f8f95d80e837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f45ef0-268a-4631-8736-b425aadeddac/dugikubejigukovik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd06b91f-041e-4750-93c5-d1524a541784/95325877762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ecf168-af30-452a-a8ec-bfccbead25fc/surgical_exposures_in_orthopaedics_h.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/36743401087.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 3220 bytes
SHA-256: d79750bb2f20a3ba9bb930b6b4b31105ffbe3c34e59909da052283356c1a5161
font_01_sfnt_off00008796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8796 5584 bytes
SHA-256: 0138c642b8e3c8888f50d505fe96ad93936850dea98e3a6c6577b6ea28e17412
font_02_sfnt_off00009ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE0 10276 bytes
SHA-256: ac67d8ba0ea72f1cacb11227e9c3b073dc841f6222af490be2a72ef6bb886fec

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