Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffab2932bece028…

MALICIOUS

PDF

32.9 KB Created: 2020-09-01 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c926e04888e9bbf2efa18887ffc8e8a7 SHA-1: 396d878c01162d7a5b96a5718fe02d1968e57c8c SHA-256: fffab2932bece02832c2589cc54e8b091caa8d26917d816e28959aac8f2a79e0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=barbecue+chicken+nutritional+information'. This URL is presented within the document body, suggesting a lure for users seeking nutritional information. The PDF also exhibits characteristics of an SEO link farm, with numerous links to other PDFs hosted on cdn.shopify.com, likely to obscure the malicious redirector. The ML classifier 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.me/wix?keyword=barbecue+chicken+nutritional+information
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/samabiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/ch_runners_yammering.pdf
    • https://cdn.shopify.com/s/files/1/0440/3891/4213/files/5280843056.pdf
    • https://cdn.shopify.com/s/files/1/0433/4397/0463/files/pibitegapefatakowilutudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/4375025120.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/34178305433.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/policy_and_procedure_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/autodesk_autocad_architecture_2015_tutorial.pdf
    • https://static.usrfiles.com/ugd/de3d83_14a7b95d47784ce48bfd525508b8b676.pdf
    • https://static.usrfiles.com/ugd/b98abb_6c19935e1e8741baa5d7f62f94298cef.pdf
    • https://static.usrfiles.com/ugd/b8c837_271cbeca9dab4340b6fc9ed23a2e7d22.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_off000043bf.bin
9679fad3ba272e565d99b335d693a28d209bee720204679e00a859955244b5b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x43BF 5196 bytes
font_01_sfnt_off00005547.bin
81fc4b33305cdc576215e4c832cbadee4e6869b674c2b2d671ea06398104edff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5547 9820 bytes