Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf269eaab4ad1f6…

MALICIOUS

PDF

53.7 KB Created: 2020-08-11 16:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af045bdc843ab2af4c6a1494d82073d8 SHA-1: f0a2137df4d2666f79957acfe46beb4a13521576 SHA-256: 5bf269eaab4ad1f61dc2130f4c8475626c87345db40f2ac98d6bcdb75f82046f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.com/pify?keyword=administrative+duties+and+responsibilities+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious redirector URL.

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=administrative+duties+and+responsibilities+pdf
    • http://files.granitestatehydro.org/uploads/1/3/1/1/131164460/9682590.pdf
    • http://fexaxax.fridaylawrencesilverwear.com/uploads/1/3/1/1/131163635/2d4125c56d8bd.pdf
    • http://files.marydarwalljewelry.com/uploads/1/3/1/8/131856318/mirej_ridebabi.pdf
    • http://files.chap-and-darling.com/uploads/1/3/1/3/131381850/vatimupeku-kojezukemugasus-sazir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/zasag.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/22255219875.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/31589761584.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/dixesufofujapiberitajasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/86457366627.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/bexobekonigisofez.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/14325605848.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/gewefobepulibeje.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/28063959174.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/ccna_book_by_todd_lammle.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_off00007806.bin
373f98557be7b764ed6208c889cebd4d566fe02ea6041965dc9b3182327e9e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7806 5376 bytes
font_01_sfnt_off00008a35.bin
fcabf9c1585302a6e945261793085b312115c8b9ce070f8cee2c32e964532b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A35 10460 bytes
font_02_sfnt_off0000ae02.bin
e922eb9fe7e0156e149d744b0d1c6ebdc7e2342e7adc201c6e704d122f29bbc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE02 17864 bytes

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