Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d00ffbbc2753fc…

MALICIOUS

PDF

50.3 KB Created: 2020-07-29 16:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb29609a45132a7e2d34fd3ba60edc52 SHA-1: b3df4247e3fb47c789dc2673c15f580659867541 SHA-256: 24d00ffbbc2753fccf551004cf128125211e2e78d83bd8453310957d376cbce6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links. One of these links points to a known malicious redirector (ttraff.cc), and many others form a link farm hosted on cdn.shopify.com. The document body appears to be largely obfuscated or corrupted, but the presence of the redirector and the sheer volume of outbound links strongly suggest a phishing or malware distribution attempt.

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.cc/pify?keyword=extensible+stylesheet+language+xsl+pdf
    • http://files.guntervolleyball.com/uploads/1/3/2/8/132816036/696fc5f80dbe.pdf
    • http://files.mychicagotailor.com/uploads/1/3/1/3/131382226/leribawaxi_zelozezexaki_lojepef_ladeba.pdf
    • http://files.spotonseamus.info/uploads/1/3/0/8/130814390/f0aee5cbc9.pdf
    • http://files.beasleyceramics.com/uploads/1/3/1/1/131164275/ketub.pdf
    • http://files.mrhaughaboo.com/uploads/1/3/1/3/131383743/9477547.pdf
    • http://files.mychicagotailor.com/uploads/1/3/1/3/131382226/leribawaxi_
    • https://cdn.shopify.com/s/files/1/0430/8847/8359/files/69739370781.pdf
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/sufuranosatetoxowejub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/gubosemovit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/56028971968.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8581/4177/files/72540749626.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2771/files/78955157564.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/56673996345.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/85654267784.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/vulonowazujotozera.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3408/files/najugiravaripap.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/nezigujiles.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/xuvova.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/folijo.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_off00008373.bin
19a65b3fcbb90a2e1820f6be40ada9081cff3dcded591ceb132ed51b5c84093c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 5244 bytes
font_01_sfnt_off00009547.bin
bf3a097574473039f828d3d6eb15b05e33af7fe8e590d8df9b9e5fa7cb62da98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 11740 bytes

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