Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a941c89c7329f56…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad60506e8a16fced1dddb0ba021f1dbe SHA-1: 928cccad61865c4131181d886c5578cb3d2bbaeb SHA-256: 6a941c89c7329f56e1ff901e5b87f8f9111608e607cbf3cb9efa35b1f288d382
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting a lure to a phishing or malware distribution site. 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/wix?keyword=sql+tutorial+kudvenkat+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/medical_english_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/vimofekodafazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/givivamivuzevafopafejufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/34549350640.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/nawidotozijexubilesidor.pdf
    • https://static.usrfiles.com/ugd/3b7182_919a82bf57ac405d909ee5769e8bffe4.pdf
    • https://static.usrfiles.com/ugd/e643da_f4e8bfa422c84a2cb52b4b8077086bb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_179209e83ce24ee09f428c79ba82157d.pdf
    • https://static.usrfiles.com/ugd/3e9e83_db10ce01859a4578b066304e2d4817e7.pdf
    • https://static.usrfiles.com/ugd/57c819_d014d85e315e42888c759d72efbc591a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_a443c12b71d844399221972ef4c7b6b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_39521c72e508469eb1881f03761e2d75.pdf
    • https://static.usrfiles.com/ugd/21e6f2_afe57efa6eec4ca08563d484a89f511f.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d396c04cf841308242185549265929.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5cd7b02488f4d298ef00202ec2908f0.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_off00005788.bin
a820f71573f7b52b80797a40de3486f83f27cce1b67046cd47fd2f0a807b8f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5788 5092 bytes
font_01_sfnt_off000068e6.bin
61c5f99801e47788f5eab3d8f17fa5dd0d8ecdee045022ec6e127b373b70eafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E6 10392 bytes
font_02_sfnt_off00008bfc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 4324 bytes

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