Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bffbb0fe1c54111…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 18:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9964a553567846a936d993a8cc8a293 SHA-1: b0b0537cec0ea520fc1c7184d170f411f2186471 SHA-256: 6bffbb0fe1c541119707a522f6c424a4c9edb4b27a3302c5775120961119c6eb
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, including one identified as a malicious redirector, which is designed to lead users to harmful content. The document body, though partially corrupted, contains text related to downloading Android puzzle games, suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=telecharger+jeux+casse+tete+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f0e51d_1dc6aab22dd14b7a9d70306de06e2040.pdf
    • https://static.usrfiles.com/ugd/374ce0_5e4e7e47ec464afc9efbcf2a7971e188.pdf
    • https://static.usrfiles.com/ugd/5a1791_0bd6caa810c044ab93f3efa54e846cb5.pdf
    • https://static.usrfiles.com/ugd/086daf_200fc65504494a599133a564b4c0a72b.pdf
    • https://cdn.shopify.com/s/files/1/0462/5019/7146/files/vmware_unlocker_2.1.1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fde680701e94438affd19eb660002ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_759fa00d1b73406ab04d855dd876ea7d.pdf
    • https://static.usrfiles.com/ugd/162fe6_d5202ea192f34e1ba29e1def74be7902.pdf
    • https://static.usrfiles.com/ugd/9d869b_24c70d5a27ed401285e16a7ad0ca0dca.pdf
    • https://static.usrfiles.com/ugd/b8c837_68914df9eb4a44ecb18c928ff4647439.pdf
    • https://static.usrfiles.com/ugd/6d59ab_51a50d188b9b4ae08bdb0bc4124f9b0c.pdf
    • https://static.usrfiles.com/ugd/a43ec6_42e708ca459a4a7c87e32b1c943d410c.pdf
    • https://static.usrfiles.com/ugd/d54300_aab5d00b3ad04656bcf18280ce666073.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654e.bin
2ee2092975e6969f2028927596a2c634580c0d73765774b2ac0e5a8a09619646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654E 5296 bytes
font_01_sfnt_off0000774f.bin
8d7c4ecf6c1acb248ce6642c09ba55bbd3b048a81f8c2c7723edbf5a6d9007c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 13264 bytes
font_02_sfnt_off00009e96.bin
1d1c58f61f61b7a4ef938880155898e7c20983bf2e5305b1974b1bf0cb100bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E96 16084 bytes

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