Malicious PDF — malware analysis report

Static analysis result for SHA-256 8032746f6d718295…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 13:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c306a9f2d1a146f8f69e9acf39d248d SHA-1: f7fc9f6862981c85fdde95b3e8341f6a46a2b464 SHA-256: 8032746f6d71829584fc895fb6f153497ca7c94712961aa63c48075e19ff4f69
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded links points to T1566.001 (Spearphishing Attachment) as the likely initial access vector.

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/wix?keyword=reading+comprehension+short+stories+intermediate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1107cff6c33844f5a82bf5b9e8e08998.pdf
    • https://static.usrfiles.com/ugd/b8c837_e73519f9ed3340439bb3c4590368a882.pdf
    • https://static.usrfiles.com/ugd/b8c837_3107130dd0a54e858557389dd20ebf96.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/97240857655.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/waferukus.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/newegasakuxaradofoxapom.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/boiling_point_of_metals.pdf
    • https://static.usrfiles.com/ugd/b8c837_5746a26cc9f74eae8e1b5bb451138be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e491e0ef7a474b159616a481487efc25.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92078842fa141ccbf09640afcee7c59.pdf
    • https://static.usrfiles.com/ugd/b8c837_65f5a4aa69d9414ab67941a57846e3ee.pdf
    • https://cdn.shopify.com/s/files/1/0440/7122/3446/files/weather_report_coleraine_vic.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/37793014044.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/bibenajobewazekebikewud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a0.bin
c3f8419d85df5e6285aa0cbda7caf21180083ade9c7b87c189a1ce0c23a95a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A0 5460 bytes
font_01_sfnt_off00007302.bin
25081fa5a81b1b6b27650c87563367f3b2ae35c96741b463b01cf288c7458178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 10368 bytes

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