Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5facd06185495a1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d006a73c97a5f4441df8f1f7e8dd1a23 SHA-1: 258ed968584492abf6e37bcd678a62231add1608 SHA-256: a5facd06185495a115b75751eb8babcae38355730ad07e0ed4ad8cf962dc4bd1
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link to a known malicious redirector, ttraff.me. It also contains a large number of links to other PDF files hosted on static.usrfiles.com, suggesting a link farm or SEO abuse tactic. The document body contains garbled text but includes the URL that triggered the malicious redirector heuristic.

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=2013+toyota+highlander+factory+servi
    • https://static.usrfiles.com/ugd/a6e5e9_9ddf8ebeb37140a58318bf42ca7d1f51.pdf
    • https://static.usrfiles.com/ugd/9f6a24_e7704854f6074626b244e250069e8e13.pdf
    • https://static.usrfiles.com/ugd/0bcf16_27b775e7b5194f60aeb0c04b583cf51c.pdf
    • https://static.usrfiles.com/ugd/bfbc46_6b295606be664c5393e751d834858233.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9a30bc7090a44ca80bfe79b7bc7f257.pdf
    • https://static.usrfiles.com/ugd/f96b02_d0050f8febdc41fe858751107e282b7d.pdf
    • https://static.usrfiles.com/ugd/271e65_94057ab5f61a49c28db8171fab71d87f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/68326246601.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/71050808726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/wasteland_2_tom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/67710455734.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_off00005ec9.bin
9a79e24dd330ee5d65c819b09b1f770751e1e87e26bd7621a97c910840150b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 5840 bytes
font_01_sfnt_off0000729c.bin
0f91cedaf5c16212cdcfdf75739c8b3dd44d1974379f562310df6eccab9b6719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 10532 bytes

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