Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da925e2e46cee4…

MALICIOUS

PDF

49.6 KB Created: 2020-08-07 02:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49fd2d6d4719a248688a42199e48347 SHA-1: fb76477c925b2f7c46b46b0a7b3f554d94b03878 SHA-256: 11da925e2e46cee455208f09414bbd9b72d293a6c85acfba99dd3dec21eae8fd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body and heuristics indicate a social engineering lure, specifically a 'Browser extension / update installation lure', to trick users into clicking malicious links. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=german+bilingual+books+pdf
    • http://files.blessedles.com/uploads/1/3/1/3/131380915/41d6c.pdf
    • http://bunuxu.anncarragher.com/uploads/1/3/1/4/131407164/kasogikow.pdf
    • http://files.europeanmatchracetour.com/uploads/1/3/0/8/130874265/xugita-tamozavigaxuref.pdf
    • http://files.inspirationstudiosgallery.com/uploads/1/3/1/4/131412558/puvox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/99013918678.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/walbro_carburetor_adjustments.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/gefemixokexadegozubaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/91928309241.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/rescuers_down_under_joanna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8778/1276/files/44558296347.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98029452840.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/vinetijijamave.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/pefigavinibuja.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/52134327683.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_off0000840a.bin
28c66c9d079234b3c69974bbf98cea2a91ca1bd0eb8f524c848b4fd2c2237cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 5596 bytes
font_01_sfnt_off000096f3.bin
0171d2ec1081195aa520f8dc60299ea88f3e51a44f58d4c109be75e2eb12a17f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F3 10060 bytes

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