Malicious PDF — malware analysis report

Static analysis result for SHA-256 901d431c69e9ec3d…

MALICIOUS

PDF

39.5 KB Created: 2020-10-23 22:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f109d770ed29092dcb580c9976f7deb SHA-1: 788d5d8c610e8f0f7037f2d805746dd2a44358c6 SHA-256: 901d431c69e9ec3de081d76bbcaab004a5c1e80f77509d7d20435ce724955b04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/123?keyword=system+of+equations+word+problems+guided+notes', suggesting a lure to educational content to mask malicious redirection. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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://ggtraff.ru/123?keyword=system+of+equations+word+problems+guided+notes
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f9142dee815f.pdf
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8b1051b9062.pdf
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f8fdee01b003.pdf
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/c88fb6205bef4b.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/aeefcf0.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/a016c237a6f.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/fagozuzir_ledek.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zewum.pdf
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/4935443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0493/0522/3327/files/casio_fx-991es_scientific_calculator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0479/6006/4156/files/mccarthyism_and_the_red_scare.pdf
    • https://cdn.shopify.com/s/files/1/0505/9117/0725/files/vaduruledumusumixunatar.pdf
    • https://cdn.shopify.com/s/files/1/0492/9005/1740/files/getibuxomurodujejira.pdf
    • https://cdn.shopify.com/s/files/1/0439/1229/8648/files/48455028002.pdf
    • https://cdn.shopify.com/s/files/1/0502/2272/7353/files/55946185784.pdf
    • https://s3.amazonaws.com/wonoti/19469558310.pdf
    • https://s3.amazonaws.com/penale/cycloidal_gearbox.pdf
    • https://s3.amazonaws.com/susopuzupure/37009297994.pdf
    • https://s3.amazonaws.com/gupuso/lexiwudifedoxun.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_off00005ae3.bin
d5c40e5b7de7469ad4bfeb2fb5e324c62699e2b4209094196ba9ca2f5673eb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE3 5924 bytes
font_01_sfnt_off00006efc.bin
043c1f51b3e8123ce1d0f76984bd94c92edbe2ceb1f3ffa2dda7ee6f1d2a5450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 9832 bytes

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