Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f6c4194e94ff5d…

MALICIOUS

PDF

60.8 KB Created: 2020-09-12 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bc7cd6e72579c1a8602502572e39193 SHA-1: 0325a68747b7da6a2469a5dd30c164bb398ff144 SHA-256: 09f6c4194e94ff5d13ee2a675c262bbb620aab449cd648ad84617bee20f40d6a
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'boater exam answers key' and a URL that appears to be part of a link farm designed to attract traffic. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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.me/wix?keyword=boater+exam+answers+key+texas
    • http://files.chunkybrother.com/uploads/1/3/1/8/131856277/7bed84d.pdf
    • http://nanura.olympicclassictbirds.com/uploads/1/3/0/8/130874493/tobutiso.pdf
    • http://pedozoxa.crewsheatingandcooling.com/uploads/1/3/0/8/130814328/4627694.pdf
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.pdf
    • http://files.ablessingboutique.org/uploads/1/3/0/8/130813616/8379538.pdf
    • http://redom.ipksportsbetting.com/uploads/1/3/1/8/131857252/xulubafude_fowiwu_sowelorujigeb_kamagigo.pdf
    • http://files.cfletcherphotography.com/uploads/1/3/2/6/132680874/271b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/namakam_chamakam_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/14199226228.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/archidoxes_of_magic_paracelsus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/disolenowilile.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/screen_capture_on_samsung_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0462/7732/9056/files/html_form_multipart_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/piscicultura_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/73239193942.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/poborezolenetun.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_off0000a8a3.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A3 2828 bytes
font_01_sfnt_off0000b29e.bin
2c567bb5ddeba3298b4eb3fa8c3dc9017a66da51b1325cf9d144cade0b120def		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29E 5176 bytes
font_02_sfnt_off0000c43e.bin
9fa91937810b9db89e0a4425ca3e2620ab0f48b3f9fcda596076b067cb5e947a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC43E 9868 bytes

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