Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da5748f1a3a5e3d…

MALICIOUS

PDF

45.7 KB Created: 2020-08-03 23:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b886ab44e896f118d2585516768febd SHA-1: bd8421130a961956a111ede3c25a917688ebdda6 SHA-256: 7da5748f1a3a5e3d03eb56b36e422ee3c85b016705ca0d7e84fc0e0f2250955f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are to benign Shopify domains, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a phishing or scam attempt. The presence of multiple external PDF links, including a malicious redirector, indicates a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure.

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=physics+class+11+ncert+pdf
    • http://files.ancientwavestudios.com/uploads/1/3/1/4/131483685/kinawa.pdf
    • http://files.emrglab.org/uploads/1/3/1/4/131406558/nazajalila.pdf
    • http://files.philosophiesofeastandwest.org/uploads/1/3/0/7/130775334/4455138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/tukunazura.pdf
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/90629120859.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/wuwigurikijivakuvir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/8169827607.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/essential_math_for_data_science.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/29230234785.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/lawanopipuvisupoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/govutunidutudoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0432/files/vimemoxenene.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/black_mage_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6140/files/58767654145.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/nawebosonexe.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_off00006782.bin
2fcd0e54350e3d19a773dc918167d603d1576af9aad00e9c2869ffd0ef955a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6782 5396 bytes
font_01_sfnt_off000079e7.bin
789707741365d078014862295d420e3011ccb7a3cfebfd6b42c529aba59fb2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E7 9980 bytes
font_02_sfnt_off00009c50.bin
3cedb121a3ead546434c09d1888acfb165857c97b5030ae5cde75df9f2fae9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C50 3280 bytes

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