Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5cc649f76af3c9…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 23:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca9f6512492996e381034fb233f1ed00 SHA-1: da782c587684ee55713943c7aee1ac7b97799484 SHA-256: ac5cc649f76af3c95c9d8c80294e3d300bf0b5ad7bc39695e1ee642aa01b5c54
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a search query. The document also hosts a large number of external PDF links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.com/wix?keyword=definition+of+culture+pdf
    • https://static.usrfiles.com/ugd/b8c837_83c94c35d1d04a19bc32a8329cb88f04.pdf
    • https://static.usrfiles.com/ugd/ca300b_585b96df71a04533a14956135097f929.pdf
    • https://static.usrfiles.com/ugd/b8c837_19cd4eecef004f498de8c0cd9678de88.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4f379460a224a6ead704852a39dfe66.pdf
    • https://static.usrfiles.com/ugd/e32576_970b8d6506a7463ab6b15743512a01de.pdf
    • https://static.usrfiles.com/ugd/2c8d66_72e4559ff91b495dbdb157c23fcd5860.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_3732f9e245c64942b6a7f029f0fc713d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdf838f6053b4991886d3a1a2d6d2eaf.pdf
    • https://static.usrfiles.com/ugd/21e6f2_969f628abc9a40fdb2d27be9151dd38e.pdf
    • https://static.usrfiles.com/ugd/a107db_379a786784df4c0892903a264ef4d573.pdf
    • https://static.usrfiles.com/ugd/67e251_24c5f6cce6ac4ed8996b70e5c32aee46.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_a0f6383110d241259105b8bad56f557a.pdf
    • https://static.usrfiles.com/ugd/2c608b_1140dc4f40ec407a8223a85f67de0664.pdf
    • https://static.usrfiles.com/ugd/71fd01_364d9559bca8472ca69bf3d00e57606e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1145e8a3264e6b93c0dce3e7f1780e.pdf
    • https://static.usrfiles.com/ugd/4c1554_9954439f53774825bbfc82381440833f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3b.bin
f733a1b490aeddfc1aac98431933ec7a9e0b975369040ac6457e9ebf21b69f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3B 4640 bytes
font_01_sfnt_off00007a12.bin
41cd7d6eaa29c06387a4e67f0290bc7cec78f854937e96ef638409a324579d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A12 10136 bytes
font_02_sfnt_off00009ccd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCD 4324 bytes

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