Malicious PDF — malware analysis report

Static analysis result for SHA-256 beeafe668b8bb84c…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 10:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f1be3c23274aedc85e794e9ec757d2 SHA-1: 467cb42edaf005fdf65cf1bf00b6fa8aca2762aa SHA-256: beeafe668b8bb84c50a74ad645e52aa5aec8c113ec2204ad470bd7352d4e791a
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL is https://ttraff.ru/wix?keyword=rlq+abdominal+pain+icd+10, which is part of a larger infrastructure of links pointing to various PDF documents, likely to obscure the final malicious destination. No scripts were extracted, and the document body is largely unreadable binary data.

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=rlq+abdominal+pain+icd+10
    • https://static.usrfiles.com/ugd/8b97dd_ef11471efa38461ba2267efeb0ed674a.pdf
    • https://static.usrfiles.com/ugd/0d002d_39170e29ee02457d89b59b85d1385814.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://static.usrfiles.com/ugd/f09a9d_a646fd5338d74c74994077089075737e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/gawatiwid.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/tejubejasupusomefoveb.pdf
    • https://static.usrfiles.com/ugd/834936_d2692a7626194ba3a6a59a9cbb3a2c04.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc438509ef674caf95ed813883331695.pdf
    • https://static.usrfiles.com/ugd/40b9e6_d7e69ef150d040819d6f4433402330ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_425f876c42304fc58deadb6123b02bf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc57052941664a6e85045ed2ea64d616.pdf
    • https://static.usrfiles.com/ugd/b85eb0_451b82c806564f44ba8161a08a500640.pdf
    • https://static.usrfiles.com/ugd/a467d2_79f9c5d627d64b76ba628c5cbfcb335f.pdf
    • https://static.usrfiles.com/ugd/d1c05f_8076fe90194840c182ff46166f01c328.pdf
    • https://static.usrfiles.com/ugd/b8c837_f52213360b5940f59a8611a098400615.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_off00006a5c.bin
46fb1cdee187495b231d820f3a66c482fb2e3bacf7c17d93ddefc014025f5b78
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5C 5412 bytes
font_01_sfnt_off00007cac.bin
9da24bad250593e408364cb430fe13abea24a08771c7ea6488a0319bc87d2f01
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAC 15196 bytes