Malicious PDF — malware analysis report

Static analysis result for SHA-256 154d8887ebbd01b3…

MALICIOUS

PDF

55.4 KB Created: 2020-07-30 06:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26a19358b009daa80931e4a15ee88d8 SHA-1: a5f3e75892e6bc50165193de8e8753c3cf9fcff2 SHA-256: 154d8887ebbd01b3c1771088cee37fc448d4ec8bd23e8a438381e0a032a2c2cb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute or host malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links points to a phishing or malware distribution campaign.

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=antecedentes+disciplinarios+policia+pdf
    • http://files.drchensacupuncture.com/uploads/1/3/1/3/131398473/dulasevoketojavotu.pdf
    • http://files.crystalsandmoregalore.com.au/uploads/1/3/1/8/131858661/3973112.pdf
    • http://files.clarevet.com/uploads/1/3/0/7/130738814/6baf8b64a8319.pdf
    • http://files.cliokirkman.com/uploads/1/3/1/4/131482999/6bd8c11.pdf
    • http://files.rosegoldrecords.com/uploads/1/3/2/8/132816041/4855756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/rinoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/lorinanojomed.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/jurekofeledutavon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/gupozowerezutiwotilafod.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/99215621659.pdf
    • https://cdn.shopify.com/s/files/1/0429/0455/1590/files/35011480768.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/taxajetutepamogelugizeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/96448799398.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/jozigonaxedobisiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/15945357437.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8664/files/vufowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/30786425645.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007768.bin
e4d479e6929e02a6e9378eb8109f2be374c9bb8ece1d6ec9fe9c20709d0056d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7768 4928 bytes
font_01_sfnt_off0000882d.bin
6257f3b4a51fee07bbdc7a0103edb82f984f2f1abac9b7738aff1e2248fe652d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882D 16424 bytes
font_02_sfnt_off0000b8a6.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A6 16204 bytes

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