Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c100ae0ca8f386…

MALICIOUS

PDF

66.7 KB Created: 2020-08-28 11:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff260ea27b1a199df7a22ee174d9ce3 SHA-1: 6f9c3b8fae1bd5247f7fbe47def94acd68ed2df4 SHA-256: 73c100ae0ca8f386c8d7389c059398dc733dbb23a479445b867b7ce75c1aa07e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a coordinated effort to distribute malicious content.

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=harold+robbins+pdf+pirata
    • http://kerukoru.tuningintowellness.com/uploads/1/3/1/4/131437792/6431923.pdf
    • http://files.prydgymnastics.com/uploads/1/3/1/3/131383838/2626253.pdf
    • http://voduko.turtlecreekjc.com/uploads/1/3/1/1/131164250/1f21164.pdf
    • http://zuveso.pavlinkoproshops.net/uploads/1/3/1/3/131379510/72cdcf56c3.pdf
    • http://galego.foxpool.com/uploads/1/3/2/8/132814930/mevadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/alliteration_worksheets_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6876/files/fanelewivuwomepizogeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/weather_report_new_delhi_today.pdf
    • https://cdn.shopify.com/s/files/1/0439/1092/2392/files/mudakap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/lagu_cinta_luar_biasa_dj_andmesh.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/64360332386.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/34654634794.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/25553087390.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/bafesoroxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/76059824183.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/juwakovulexure.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/90678893116.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_off0000c831.bin
614029510dad2d771a148d2380b7087074ba6604a00aca34b736b3a57fadfddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 5136 bytes
font_01_sfnt_off0000d9a9.bin
eb9a597fd0b181c0ec468aa5b147c0b268a2a8c943997fde5cef4d8785b4cc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10548 bytes

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