Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7a4bf86d271773…

MALICIOUS

PDF

54.9 KB Created: 2020-08-05 10:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e55777061dd1d11b1296924a4c40a8 SHA-1: 75fddcc00995f51d73708b7d0c04b7acb28ce0bd SHA-256: 0d7a4bf86d271773ec22777cb1d223188e2d025ada155dad99805c84185e5ce6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a PDF about English words and their Punjabi meanings, likely a lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=daily+use+english+words+with+meaning+in+punjabi+pdf
    • http://files.vaughantractor.com/uploads/1/3/1/3/131383921/453b7de28b885.pdf
    • http://files.surplushousing.com/uploads/1/3/1/6/131636988/kivimev-vofulos-wibukoxaxof-melaluvev.pdf
    • http://files.ub-arts.com/uploads/1/3/0/7/130739598/lofedov-dezitawakupuna-viwevorunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/9379248699.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/19457003161.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/kufujaxaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/bopewanig.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/wezinex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/regukezugaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/rakazuwuzedajawinubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0435/6715/3313/files/tubadevufanojamirabapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/home_decor_magazines.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/xewefugiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/84822236828.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/bugelurojalo.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_off00007774.bin
771ecb4b60a9f6a86b08301cf2690128d291ebfb89caaeffb1f0b7fb67c930f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7774 5864 bytes
font_01_sfnt_off00008b58.bin
4f1ce7d1317d1b0f7d8030054a6a0c22e299d6aed75ccaacf8e11b4560b593ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B58 7776 bytes
font_02_sfnt_off0000a4fd.bin
c8813e897f5f98b2c8e1f3f6c6c4cb5ba80ef2c3d22bfa50828040625a8abb21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FD 12776 bytes

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