Malicious PDF — malware analysis report

Static analysis result for SHA-256 125bbc129475cbb5…

MALICIOUS

PDF

79.5 KB Created: 2020-08-11 07:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 497838ce3c92ec8b56c13461ba170be2 SHA-1: 8081c03f298449a382a1e340a9e2041ab5acd9db SHA-256: 125bbc129475cbb5345f0f7ba46143a35a866caf2f7cf606bb81703e2ce3ebd4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and appears to be designed to mimic a legitimate document to deceive users. The ML classifier strongly indicated maliciousness, supporting the finding of a malicious redirector.

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=cunningham+anatomy+abdomen+pdf
    • http://files.shadowgangs.com/uploads/1/3/0/7/130740049/8061193.pdf
    • http://mavexo.perthfrenchtheatre.com/uploads/1/3/0/7/130775904/lujus.pdf
    • http://files.pamelacarr.com/uploads/1/3/2/6/132681409/a00c67548.pdf
    • http://nimijup.mathiashse.com/uploads/1/3/2/8/132814930/kewagoxi.pdf
    • http://files.maplehillbluegrass.com/uploads/1/3/1/6/131607712/9c8f969c6b126ae.pdf
    • http://:digitalcommons.unl.unl.edu/libpraphilc/1408
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/49863135032.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/weather_code_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/29315339004.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/da_form_5172_r.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/jawijuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/5280263328.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/32114950520.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/d_d_shackled_city_download.pdf
    • https://cdn.shopify.com/s/files/1/0450/2857/3334/files/ser_bachiller_enero_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/tafufuvelasolikigig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/mobamipugufomojokuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/wotisodaposanivotosepube.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_off0000fad8.bin
f7d706fd05c8e45e635f74497836e81e788437961c1c1ae0bfd28624576fa5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 5296 bytes
font_01_sfnt_off00010cbd.bin
5fe50316351bfd6b7cbde97bfb1830f98e733ba0d1bf9cf4f3b7d9d6722c8ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10620 bytes

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