Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e8a61b9dd5bb8e…

MALICIOUS

PDF

54.3 KB Created: 2020-08-06 10:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394a0eeacd2be3b72e551f8d6951f502 SHA-1: 96684dc1b5e0c69a22056bf482e8ec34f9ddf7d5 SHA-256: 28e8a61b9dd5bb8ecdbe30d0ff4c3a1e886de3e0a4ac0c7817c5de7fd1c3c235
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=base64+encoded+pdf+file+php'. Additionally, it hosts a large number of links to PDFs on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a reference to the malicious URL, reinforcing the lure.

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.cc/pify?keyword=base64+encoded+pdf+file+php
    • http://files.faithfullyfitforlife.com/uploads/1/3/1/1/131164176/kivuwovafatukix.pdf
    • http://files.tametracktour.com/uploads/1/3/2/3/132303083/dodenosejesuwogeja.pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.stampoutcancernow.com/uploads/1/3/1/4/131483445/7560114.pdf
    • http://files.knealenotarypublic.co.uk/uploads/1/3/1/4/131437225/dd0b561683.pdf
    • https://cdn.shopify.com/s/files/1/0433/3712/1951/files/jolly_phonics_workbook_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5196/files/mercruiser_350_mag_mpi_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/durukadotunasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47948794002.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/82864753742.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/fenezozavumurigekudobajir.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/jefezed.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/toyota_aqua_2020_manual_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/11th_english_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/adenite_mesentrica_pediatria_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/21024349416.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/87061591774.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_off000084a9.bin
9c02b77a5d10e5383b4aea154f74b1ac6ad750a047228471649f937290ec5d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A9 5440 bytes
font_01_sfnt_off0000972d.bin
e33976b9bf4d725465a92fa0bb8b42f93712f9f73ded896fc848e97f60f449d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972D 16208 bytes

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