Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521eeb034057e9a…

MALICIOUS

PDF

54.6 KB Created: 2020-11-08 01:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4f08fd3c96c8e1180f0d176fa4934fd SHA-1: 1b12b4a69d161a03bb84e2a1f5bb3696c347af5d SHA-256: 8521eeb034057e9a37256200c3ddd90221b08ac8478ac252a674e77a2ef73459
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The document contains numerous embedded URLs, with the primary one being a redirector to 'ggtraff.ru', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, likely leading to phishing pages or further malware.

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://ggtraff.ru/123?keyword=www.craigslist.com+western+mass In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5f9f40f46b64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f92343f66240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5f9ddad15a62c.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/xufoxudogolir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5fa07a905e72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_5f97bfcde3bb0.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/wirolobekup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f967087adcc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_5f9656672139a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_5f9e84378e5c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://larevugarowu.files.wordpress.com/2020/11/difosobawovetexojitibex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 5256 bytes
SHA-256: 7a45707d8f18a552c6865fd829bf67d2edbe25acdb0f0ad80c12a2ef1b863b56
font_01_sfnt_off000079ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AD 6336 bytes
SHA-256: 1a4cc3c0023354af470c323a9df1abdfb44fe1bdbed6720647b08cf0cbc0a128
font_02_sfnt_off00008f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9B 11828 bytes
SHA-256: cbb864957b9e37e4a401fec8e1f2a39fe1eb2e9d846f824b859626187ca0135b
font_03_sfnt_off0000b709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB709 16596 bytes
SHA-256: 340908f3a8561ac4e0d18218cef20d846cf5949eedc67936adea0ce4e632703d

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