Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fabea9a56fb65d5…

MALICIOUS

PDF

53.2 KB Created: 2020-07-29 12:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6465194cfe2b09de91310ebd27bf3f SHA-1: a18d9f0aa14bbf01bbef94f34fd55cab8e32bdfa SHA-256: 3fabea9a56fb65d51a6972da4680c869980199910f94d5bb9be8231073c1f779
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'Los 4 acuerdos toltecas pdf', likely to entice users to click on the numerous embedded links, such as the one pointing to 'ttraff.com', which is known 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=los+4+acuerdos+toltecas+pdf
    • http://files.leapoffaith4u.com/uploads/1/3/1/4/131452938/fatur_napukisuwulul_ziwutoni_dukinigud.pdf
    • http://files.brittanypatel.com/uploads/1/3/1/4/131482941/galekukawato.pdf
    • http://files.communitylifecompetence.org/uploads/1/3/1/4/131414134/9887347.pdf
    • http://files.allenpricephotography.com/uploads/1/3/1/4/131452840/modevo-gegigodelup-pilaxi.pdf
    • http://files.seedsofhopefdn.org/uploads/1/3/0/8/130814984/b1a9ea32523e0fd.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/maxovugumapivirisovadeta.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/20656878311.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/25262501747.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/towiduligowiwuni.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/31877555856.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/komedofez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/lamidiwadokonolupevutikuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2327/files/30421986363.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/xixapasitalirotedipopude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/88789977661.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/zizelebivojefubowumegok.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/43894709904.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_off000090d2.bin
59e60b27cbd0b1c24e6f5ae9421f9b5aa92234da16265e470d5889abe05cc8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D2 4908 bytes
font_01_sfnt_off0000a19e.bin
322e7c82e63a2ecd84e68a2f6e1ddbc332d8553c86e238f28d4e414aa2061834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19E 11296 bytes

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