Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fd85b947cac682…

MALICIOUS

PDF

32.7 KB Created: 2020-08-24 20:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bde7687a9fc3a2fcfa2ba9935627fd3f SHA-1: 9ef4a10c2fa35a9547399cde4d7b38a27a31a613 SHA-256: 04fd85b947cac682a4692bfd2de05cf6fe9e010c7a8d9a0fb3a92a495caa1895
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous external PDF documents, with the primary link pointing to a known malicious redirector. This suggests an attempt to lure users to malicious content, potentially for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=bindiya+chamke+choodi+khanke+dance+performance
    • http://files.temeculavalleyvegansociety.com/uploads/1/3/1/0/131070207/bunafatapefow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/13696982684.pdf
    • https://cdn.shopify.com/s/files/1/0463/6649/0779/files/fallout_4_mod_organizer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/4925542976.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/stardew_sprinkler_layout.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/ageusia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/minecraft_morph_mod_1._8.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/74462240974.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/gidatenikokepo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5841/2185/files/xijobanigak.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_off00004667.bin
b74bcadc8037e83058ff7009b2d2b1ef21d733c736ace75247a66cbd193bd686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4667 5400 bytes
font_01_sfnt_off00005895.bin
45c963933160d33773b4b7ca460ed52d14e811c8bb99cd9d13e37593188b8527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5895 8580 bytes

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