Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f70d8b32389a5ac…

MALICIOUS

PDF

44.4 KB Created: 2020-09-05 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0391296c9a07640faa202527a445310e SHA-1: c7a42b57ea531f206055452616151a5fc3070ddf SHA-256: 3f70d8b32389a5acf88b3ec170c33b960c24e94d54bbc722832bf691217c8d7e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the suspicious URL and references to 'asme b16. 9 pdf', suggesting a lure to disguise the malicious intent. The presence of numerous benign-looking PDF links likely serves to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=asme+b16.+9+pdf
    • https://static.usrfiles.com/ugd/39d081_3a3ffc7ca5544ff8805ae24cd4cf1752.pdf
    • https://static.usrfiles.com/ugd/b8c837_fda6dc78d40043f6abcadc51081db8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_765281d8729b4e3083c224be80ecbd8c.pdf
    • https://static.usrfiles.com/ugd/78c764_923c551d480b419bbe85c03142deacc0.pdf
    • https://static.usrfiles.com/ugd/de65f7_089144b0efc14cae807a93230054c273.pdf
    • https://static.usrfiles.com/ugd/5926b4_82b6e182dfd14ed48fddaac5507a7591.pdf
    • https://static.usrfiles.com/ugd/8ff694_9b9056f1662f4da5b32cb40cb3a38f6e.pdf
    • https://static.usrfiles.com/ugd/d2057d_d11a2ae1e5724990b93b632e794b9562.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_f2b7ff1b7ec14916b34f439607c79861.pdf
    • https://static.usrfiles.com/ugd/b8c837_80314a30d10c4facaac57f5f2912e18e.pdf
    • https://static.usrfiles.com/ugd/5ed537_3178b77121fa4b1d943580014bc2f913.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_b4b909cd8fe740bab5baf47bf8c73d1d.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/vowuwosidajajut.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/gugumesun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/75503644600.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_off0000692e.bin
7dd0dc1dd537c7463c9071ab116cc61d836a29d06e088fa0c2a45651c16a70cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692E 5372 bytes
font_01_sfnt_off00007b6d.bin
69ad262974f2e124d92a929fe6dec880a242799bdb09787848d7751f48ac58ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 13384 bytes

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