Malicious PDF — malware analysis report

Static analysis result for SHA-256 0867bb79d2c9321d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-05 11:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fec19d839ed1c2f62326ec00745499 SHA-1: 6e4d151946a0ad877da406dc88b7a1f8fdba680c SHA-256: 0867bb79d2c9321d1af6de1f1719330e487d48bc32dc3f25debbe5a6061cd8c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=gastritis+aguda+erosiva+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify-hosted PDFs, reinforcing the link farm and redirection attack pattern.

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=gastritis+aguda+erosiva+pdf
    • http://nagifibi.greathorwoodhistory.org/uploads/1/3/0/7/130740013/4ba74f.pdf
    • http://files.gasureplumbingandheating.co.uk/uploads/1/3/1/4/131437471/sefiviniv.pdf
    • http://files.raidindeejai.org/uploads/1/3/1/4/131408209/pozedapabamamifawog.pdf
    • http://files.thomastownns.com/uploads/1/3/1/4/131407952/9623114.pdf
    • http://files.musicalsforchange.com/uploads/1/3/2/6/132681891/sikanujapiwapaz_wipibazegi_vexopesuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/95352671140.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/11681741483.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/84549706046.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/11345036598.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/kosarevuvaleroju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/kiradoluso.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/84959175996.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/lurivosawekog.pdf
    • https://cdn.shopify.com/s/files/1/0439/0086/2619/files/85215132869.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/44286021547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/93076636556.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0b.bin
88aed3b56cb2fbe026d5c075adcd5b5f49f2d64e0be4a74df2ebeee5740b518f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0B 5044 bytes
font_01_sfnt_off00006f5c.bin
f123a1432bb9229b503a88c6b0952f0866a0d95441e156ee4de9dede8b25b438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 10076 bytes
font_02_sfnt_off000091c3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C3 4324 bytes

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