Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cdac685e6b8c5a…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f45722fe0c5f6b981135b9ea555d129 SHA-1: 0cf1883b0338ef5ee13a6283ed6d3259bf8bb1a5 SHA-256: a9cdac685e6b8c5ab9230e2757970d193497e19fe7cb110317517c7b5c4d488c
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.link/wix?keyword=polaris+performance+parts+canada'. Another heuristic detected a PDF link farm with many external links, suggesting a coordinated effort to distribute malicious content. The document body, though heavily obfuscated, also contains the malicious redirector URL.

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.link/wix?keyword=polaris+performance+parts+canada
    • https://static.usrfiles.com/ugd/74a852_7cedd8b423114bd19dd36538c2669874.pdf
    • https://static.usrfiles.com/ugd/f55bec_a0f7805cc38247b9b90da7f6461e67de.pdf
    • https://static.usrfiles.com/ugd/7c3584_515e681c62a54102a0fc91b393269d42.pdf
    • https://static.usrfiles.com/ugd/4aae87_6dc5bf72033448efbf96e7daa9e5ec64.pdf
    • https://static.usrfiles.com/ugd/4b68be_a10b81f81b8748da90275e25bd826105.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/60149683385.pdf
    • https://static.usrfiles.com/ugd/b88e3d_bc05d66a33aa4b698e8ed29533544981.pdf
    • https://static.usrfiles.com/ugd/895bef_590e2ded995d4f5c996f6bc8f6d0a54d.pdf
    • https://static.usrfiles.com/ugd/04c368_1998445a06104831bab1067b26edbb72.pdf
    • https://static.usrfiles.com/ugd/03ae60_3be21cbf8c8e4fdd82fd927e9d2b1410.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/10115768411.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/munomitezovojope.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/sesopozusijavexin.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_off00006177.bin
f07eb184ce624d50040b49a45db19bf468ec38b8b02ce184575e49b8c72c2b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 5300 bytes
font_01_sfnt_off00007367.bin
e5a908c663ad1e5cf22f838366894362f52f1dbadcdb96a6a83b7011f9ee9920
pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 9888 bytes