Malicious PDF — malware analysis report

Static analysis result for SHA-256 06076d9bfcf8c683…

MALICIOUS

PDF

35.2 KB Created: 2020-08-11 08:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e1497dfbaea8a2f0a7e1851b4876ba SHA-1: fc349e9ff6d78c6cf417cc0dfefbce45c7fdc0ad SHA-256: 06076d9bfcf8c6837a51818d8a362dec08008135fd35f136da742d89b1f79fc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm intended to improve SEO for the malicious redirector.

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.com/wb?keyword=maxwell
    • http://files.mrsclynedaviscoolclass.com/uploads/1/3/2/6/132681194/batudopib-sexibizunegi-dinizolibaraxu-tuwigas.pdf
    • http://files.uniquethingsbylingmerth.com/uploads/1/3/2/3/132302921/ladew_sinawi_gatidanetale_zazuwaritusa.pdf
    • http://jetoliwe.sewingclassmiami.com/uploads/1/3/2/3/132303382/zagusemaluvozot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/92908129591.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/calendario_2020_con_festivos_espaa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/vonamukawedakevoduj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/install_adobe_printer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/50704620274.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/bbc_english_literary_companion_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/lodedosabugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/jabaxowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/css_image_background.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/viginigufomabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/amniotic_membrane_transplantation.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049db.bin
983cb2a5900dcc6289072866797d0adca50e31c9c0b67afdbbf45dd3e1138aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DB 5656 bytes
font_01_sfnt_off00005d10.bin
ef8380724cc6fa51f7ab4d8fbcf700cb20aa790f7ccc651e848cf9888055335d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D10 10028 bytes

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