Malicious PDF — malware analysis report

Static analysis result for SHA-256 713ba564484ef77b…

MALICIOUS

PDF

46.2 KB Created: 2020-10-01 11:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5de562842ccb9a784ca5e6d300759f3f SHA-1: b2a3c1bdc7857a08f4db853741e01b5db9404ea8 SHA-256: 713ba564484ef77b606f9d67bcca718542f03f4467f5b081d307c6c3c06fc260
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine results or redirect users to harmful content. The document body itself is heavily obfuscated and contains a URL that aligns with the malicious link findings.

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://gettraff.ru/strik?keyword=free+weights+exercises+pdf In PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/kipiwumafumudo.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/76690950621.pdfIn PDF document text
    • https://site-1038326.mozfiles.com/files/1038326/20681878791.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/8202262470.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/sasolilaga.pdfIn PDF document text
    • http://files.theforgottengospel.net/uploads/1/3/0/9/130969494/latomutududi-vopan-mepebawifu.pdfIn PDF document text
    • http://wawodev.worksheetresources.com/uploads/1/3/1/3/131383330/rujavodige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/53dfef3a-87b7-453d-bfe1-88a5ce274d80/72607683569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/dimivevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/posemiparetilijagufelowam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/misewipiduramubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4336/2715/files/61728685132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1701/9292/files/dazutiwodemibalaxud.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_off00006b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B62 4864 bytes
SHA-256: 50ab1f4a736963628b0c76cb29f71a83094705c44b2058834ed14cb87aa584c7
font_01_sfnt_off00007c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C27 9844 bytes
SHA-256: afb2b07d5308bd305c57e418f88e552bc684b2e5c15ce51cc2f052ed4da266a2
font_02_sfnt_off00009dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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