Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ef06c13df7f154…

MALICIOUS

PDF

55.1 KB Created: 2020-08-19 19:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf49c8995585955bc3bef2a779aef62 SHA-1: 6fd0f53ef7eab88a4a0c26a431f29fe9a2474200 SHA-256: c4ef06c13df7f1540a6f6f231ecb41567bc397c1064ea6a44c8a12a86822462a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body contains the text 'Make me lee child' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a link farm designed to redirect users to malicious infrastructure.

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/pify?keyword=make+me+lee+child
    • http://files.ovbands.com/uploads/1/3/2/8/132814949/4672714.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/40100912683.pdf
    • https://cdn.shopify.com/s/files/1/0439/3621/9291/files/a_guide_to_drawing_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/6841/5400/files/yield_management_cours.pdf
    • https://cdn.shopify.com/s/files/1/0436/9154/0634/files/wisixisademozotovejika.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1323/files/fancykey_keyboard_cool_fonts_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/43773714455.pdf
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/jozotefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/jovavi.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/aprendizagem_baseada_em_projetos_guia_para_professores.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0431/8026/1525/files/verojobevazifetinejo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/buruweketopuwobojogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/credit_card_authorization_form_free.pdf
    • https://cdn.shopify.com/s/files/1/0447/3297/3205/files/15028738269.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/liliths_throne_game.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009032.bin
274e11e10f09f7fc35bbd37ea3635ac1f0ca58a6b29c660ad77d029516002d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9032 4468 bytes
font_01_sfnt_off00009f59.bin
48b77019e4a323bd8c063384432eea7232e58732c32e2374b2c1cec55e1777ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F59 10068 bytes
font_02_sfnt_off0000c1a8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A8 4324 bytes

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