Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4b94860efb13f…

MALICIOUS

PDF

51.8 KB Created: 2020-08-22 18:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 707461a0657a99a55f401e7edef91499 SHA-1: c827435d9734430c90fcd06342e551195cd59eaf SHA-256: 81d4b94860efb13f947fab7048f701e5f651cc2f8423266510b9cd4c600140ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=english+alphabet+learning+video+free'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the same redirector URL and references to learning materials, suggesting a lure to drive traffic to malicious sites. No scripts were extracted from this sample.

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=english+alphabet+learning+video+free
    • http://womonefur.laurelpta.org/uploads/1/3/1/4/131454165/af928fd393f4.pdf
    • http://files.extremeimprov.co.uk/uploads/1/3/1/6/131606630/kiwogi-xowixefojariza-pimujabaguvak-tukor.pdf
    • http://viwegem.stonycreekpembrokecorgi.com/uploads/1/3/0/8/130814397/367862.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5690/5885/files/pupofidawez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/49981770579.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/bayan_linnas.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/japanese_yen_to_aud_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/coordinate_grid_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/14643064733.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/lamad.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/vofejoberama.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/nomutitetunuwefinogasu.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/teziz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ce.bin
a4647b97cd077839e2542facf7da67911f2a8e6c999d20f0e0499e0516c86472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CE 5460 bytes
font_01_sfnt_off00007b55.bin
737772f54a6d36edda5a6755807245c483755a8a876b826c5e3eed4079e16a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 13016 bytes
font_02_sfnt_off0000a54d.bin
2cf5ab5f9242bf0256ebf9447757c8b98172b3e589ca6531c301b482fda79699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA54D 16108 bytes
font_03_sfnt_off0000ba0b.bin
551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 1736 bytes

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