Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc7c5e6cd81885f…

MALICIOUS

PDF

49.4 KB Created: 2020-08-31 09:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d037dccd0a980dfc7c482ceee65fbd1d SHA-1: ea4f0710417cd0892ed7c7525bdef5c3684ff330 SHA-256: 9bc7c5e6cd81885f36c3cc10fac44699757162178e549b96b4d44f1117e377ac
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, indicating a link farm. One of these links, 'https://ttraff.link/wix?keyword=sailor+moon+video+games', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary 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.link/wix?keyword=sailor+moon+video+games
    • https://static.usrfiles.com/ugd/3aca14_088359fc93c84b17b7bdb5a96f2a87c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2ca64bcc87477fb5d65930b045d250.pdf
    • https://static.usrfiles.com/ugd/b8c837_67b9ccdada164c6a900a4d6c5e32945d.pdf
    • https://static.usrfiles.com/ugd/3be3a7_359f285c00044fd1b7bf5466b68f53ff.pdf
    • https://static.usrfiles.com/ugd/95089d_cf912adc719248dbb513aea35b55bbc8.pdf
    • https://static.usrfiles.com/ugd/432b07_13d0172875994f11b40f9d4596c85859.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4359/files/cryptocurrency_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/xujikad.pdf
    • https://static.usrfiles.com/ugd/93c935_12d6c9270d6b4b048510b2dc9aa9b220.pdf
    • https://static.usrfiles.com/ugd/6cfc61_f3fe8b03729845118d55d04706b17874.pdf
    • https://static.usrfiles.com/ugd/de02f3_dd05974cf8b048739c8dd296a9585f65.pdf
    • https://static.usrfiles.com/ugd/50c35f_efd7216b230045f59d8ed7a16db8dece.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_off0000807a.bin
53cdda4af012d7bcb8faaf74d325949c24a57c7172c512618df8384f786b0323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807A 5308 bytes
font_01_sfnt_off00009268.bin
6b7aeb7fdb2d527be16ec38fd948545da0d0c4ea80be0ffde09d31df0f18226a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9268 10952 bytes

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