Malicious PDF — malware analysis report

Static analysis result for SHA-256 6936ceb0e9d1218a…

MALICIOUS

PDF

46.5 KB Created: 2020-09-01 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be0985bfb3631e6a1169f8062caeaefb SHA-1: 21bf4f3397e04055cad95719ac11f661bdf4806b SHA-256: 6936ceb0e9d1218a0cce2a9314c1533b98f30c726c45372e3b3e6bfd525bf35d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host or distribute malware. The document body, though heavily obfuscated, contains text referencing 'Chroma key pro apk free' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, potentially for SEO poisoning or to obscure the primary malicious destination.

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=chroma+key+pro+apk+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_12dbbae6700946b2bd35f5b8641ff41c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a84918c81c784b88a640d33f38f09a31.pdf
    • https://static.usrfiles.com/ugd/bb13a2_2a3d035b8eca4a85b8d94bb44af7466c.pdf
    • https://static.usrfiles.com/ugd/b8c837_07b7e67539e94b319f124c84ebc7e973.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_5f91c67814f1478194e72ccfbd2218d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7225017309e44729c869f52e120b987.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/65894828697.pdf
    • https://cdn.shopify.com/s/files/1/0459/1285/0581/files/81838161467.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/bruno_mars_zip.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/rodetaf.pdf
    • https://static.usrfiles.com/ugd/19103d_8dc93e22c8c54cc89dd04f52325ab932.pdf
    • https://static.usrfiles.com/ugd/15cd4d_248e49790f524a91a13133cca605cb49.pdf
    • https://static.usrfiles.com/ugd/c0fca2_e0718a479b4e4da3843048f19b8dc0db.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_63d91523a265465a9c27ff454485a0aa.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_off0000668b.bin
832f0da08e5ad2f54961c948ab655f84484c58ecbe39971bfa91f13da21e99ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 4672 bytes
font_01_sfnt_off00007670.bin
249ecaf2a343494f399a8064bd136511f5323999895cb884d4a5f542143473f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 12692 bytes
font_02_sfnt_off00009f70.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F70 4324 bytes

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