Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa43bee4a2f190…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 09:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6d493161ed525293e16735b198cc16 SHA-1: d2dc942dd626360413d7e52aa9c90044597e4885 SHA-256: a1aa43bee4a2f190c5a377565ae4befe61e8e5e57772f94c6e4ecd9116a6d378
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links directs to a known malicious redirector (ttraff.ru), and the document body itself contains the same URL. The PDF also exhibits characteristics of a link farm, with many external links pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute content widely. The presence of a malicious redirector link is the primary indicator of malicious intent.

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://ttraff.ru/pify?keyword=break+even+point+adalah+pdf
    • http://files.eficusenergy.com/uploads/1/3/1/3/131398143/309f2442f0.pdf
    • http://files.peabody-fence.com/uploads/1/3/1/4/131407952/5580244.pdf
    • http://taziduw.modicash.nl/uploads/1/3/0/7/130738870/6835161.pdf
    • http://favab.givinghandsministry.org/uploads/1/3/1/3/131397971/denagagegilafis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/favovirusuzevezanumewavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/eclecticismo_arquitectura.pdf
    • https://cdn.shopify.com/s/files/1/0448/4897/1938/files/download_bacaan_surat_al_mulk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/midebuguxoxivukugofaxuwos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8514/files/86290041091.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/gudapol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/i_write_sins_not_tragedies_lyrics_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0443/8881/0918/files/the_beggar_s_opera.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/80051549542.pdf
    • https://cdn.shopify.com/s/files/1/0433/8440/6181/files/temaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/gewuxinubedunixakego.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007458.bin
a887d4e4aa97d68656b0e572174e8783c4cbfc8c37ad3770a528da483cdb8c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 5124 bytes
font_01_sfnt_off000085cc.bin
51cf14f1ceb9edbd09c6fcb18c12ca8d5472cac9aa39799edb5c389a7afd5d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CC 10080 bytes

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