Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4682088f16bcde…

MALICIOUS

PDF

32.3 KB Created: 2020-10-30 00:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 44eb23d21bb2136a542dd9f9e3690a7c SHA-1: 94223a5f460bb50eb036117ae8aab8b3828f1402 SHA-256: 8a4682088f16bcde9f17edb205a0b6c8e1cf5cc9febb6695abbc1baebc802572
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO manipulation or to obscure malicious redirects. One of the primary links, 'https://gettraff.ru/aws?keyword=2007+f150+haynes+manual', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=2007+f150+haynes+manual In PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/modopikisafujaf.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/679953a8556.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/8823033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8d55033cb00.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/lotejokojopu-tezamudusab-jujitegalos.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/41e3b2f476909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f9a2697a4a33.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/1/0498/3570/4482/files/procedure_for_yoghurt_production.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6479/9644/files/nissan_qashqai_2020_workshop_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0360/7702/files/fidixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5255/6184/files/himnario_pentecostal_de_chile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0342/7993/files/knee_stabilisation_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7885/3812/files/86278714219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6948/0600/files/vojomolukifonuwisufutuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8479/0973/files/how_to_move_villagers_in_new_horizons.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_off000044da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44DA 5448 bytes
SHA-256: 428476c8f592b9416d72800bcd08235540fb59131f8aa7d03d0a668624543af3
font_01_sfnt_off0000575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x575A 8560 bytes
SHA-256: 2926808d62163ff79adc8082e5ed0c9a9e3401390a468783f284eeb23b3afa62

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