Malicious PDF — malware analysis report

Static analysis result for SHA-256 316761b1317da19a…

MALICIOUS

PDF

79.9 KB Created: 2020-10-12 04:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 87b6ecd5bca71fd068b1774caa17fc30 SHA-1: aaff53b4aa93b37583db254d84d39d67f85b72fb SHA-256: 316761b1317da19a9a4f1083a9bf6304c25320de2d02d956790bd334122a982b
124 Risk Score

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 pointing to 'https://cctraff.ru/pify?keyword=latin+english+derivatives'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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://cctraff.ru/pify?keyword=latin+english+derivatives In PDF document text
    • http://files.stchristophers-mn.org/uploads/1/3/2/8/132815306/kunikumoguji.pdfIn PDF document text
    • http://vavugowov.premiergoldendoodles.net/uploads/1/3/1/4/131406211/lapifobisiwaxerulowu.pdfIn PDF document text
    • http://xilaxezag.lforlupus.com/uploads/1/3/0/7/130775451/2663980.pdfIn PDF document text
    • http://files.enaturalshredz.com/uploads/1/3/0/9/130969810/kowutojumetusifom.pdfIn PDF document text
    • http://files.hinkinhistory.com/uploads/1/3/0/8/130874535/4932222.pdfIn PDF document text
    • http://files.greenpick.net/uploads/1/3/2/6/132682137/46e8f0e15281d62.pdfIn PDF document text
    • http://files.kyotosushimn.com/uploads/1/3/0/7/130775821/dukep_xejuletevu_nusow.pdfIn PDF document text
    • http://files.cleansquadsf.com/uploads/1/3/0/9/130969204/vupapaponitibibaxuju.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/9eb07421-c8da-4ac7-a445-aadf3421b84d/jikabugosobirokasipanoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7685a4-ccf9-4c83-b1e2-5ae3f7d0e79c/34359870184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd3938f-f283-4f5e-8b04-a3f0bcb623b6/roravuzegul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff58996-1b2b-456c-ae69-52a1ebd88918/49484840776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9169961e-ae42-4d2b-8d3d-d67a17d2a638/pijubelaronosegesobiwipe.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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5088 bytes
SHA-256: a5e07819b848ceba8cd425d3b02c8477a37ef3f791906d3fd1ebfb8f4642dacb
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 9932 bytes
SHA-256: 2f9f27367ca2bcdbd590dfd2f569fc0456fc5c400dee3f5445edd4825f7efa9b

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