Malicious PDF — malware analysis report

Static analysis result for SHA-256 923c6ac26456ed3a…

MALICIOUS

PDF

35.6 KB Created: 2020-08-01 21:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2137061a9790bd3d6836529338e8d311 SHA-1: aa2fba3ca3d8a3759f7928f96155b7290c7c1a96 SHA-256: 923c6ac26456ed3ae52455181c0fe424b7f21ff2618f61fb5bcb492ed796d1b0
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector at 'https://ttraff.cc/pify?keyword=troybilt+tiller+manual'. The document body, though heavily obfuscated, contains references to 'Troybilt tiller manual' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=troybilt+tiller+manual
    • http://files.profepeplinski.com/uploads/1/3/2/7/132740498/motojabonudesa.pdf
    • http://files.collier-pave.com/uploads/1/3/2/7/132710779/4626283.pdf
    • http://files.tierrasantajuniorwomens.org/uploads/1/3/2/6/132695200/kamotazesun.pdf
    • http://files.medicalimagingstore.com/uploads/1/3/1/3/131379183/f912b088997.pdf
    • http://files.beep-beep-remember.com/uploads/1/3/0/8/130874086/goxebafaduj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/how_to_merge_folders.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6003/files/jalopifimekavukofodutajek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/kanajuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/49737393613.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/5028474692.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/67319416273.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/mizabesalafutenupin.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/buvanirazafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/rubedafibu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/tukosepaxim.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3383/files/31494577822.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/nenekome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/51058234605.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_off00004f53.bin
a99de91e3bad0bf38889f8ce458d166259e51004a7118bb7c6fb897c26609f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F53 4844 bytes
font_01_sfnt_off00005fb6.bin
dc1b4c57919a554381c5067eab5199c2fe46f9b08c8e7f1e3ae7c2fd89a4f869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB6 9716 bytes

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