Malicious PDF — malware analysis report

Static analysis result for SHA-256 3520d0dc6180c640…

MALICIOUS

PDF

41.9 KB Created: 2020-08-12 20:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a8a8754a0fc03087405f13095239a1 SHA-1: 32f615baf8def9f841e4d624c83ff7dcfd9452c0 SHA-256: 3520d0dc6180c640928b17e465878f387561f18f6d320dd8f29a112d7e8f017e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector hosted on 'ttraff.com', which is flagged as malicious. This redirector likely leads to further malicious content or exploits. The document body, though heavily obfuscated, also contains the same malicious URL and numerous benign-looking PDF links hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious verdict.

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=separador+de+pdf+justi%25C3%25A7a+federal
    • http://woluvuved.sachabas.net/uploads/1/3/1/6/131607163/966026.pdf
    • http://lojebuta.mkaytemple.com/uploads/1/3/1/3/131383283/fawukiloxo_fezol_nupebimiwaxedom.pdf
    • http://mixenobo.donaldebrown.com/uploads/1/3/1/4/131409090/buwijata-pizajawuxabi-tasutipomopeji-fumupaj.pdf
    • http://files.attorneystakingaction.com/uploads/1/3/1/4/131410158/d75e9641.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/cerere_demisie_la_zi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/the_metaphysical_school_of_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/nivadenanexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/shoulder_impingement_physical_therapy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/15941457677.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/saly_salon_game.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5764/files/mivige.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/46588537915.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/3684162719.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/gukijelitatekiveb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/34455778192.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ded.bin
6b9db1df5f5e44f541260462a901e4957f6b170142e2067a9f9894e0dff26420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DED 5396 bytes
font_01_sfnt_off00007058.bin
37f4704ef5d9d1cbaf89a017c305d3d801b02398421e26df5eafa97308353391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7058 13272 bytes

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