Malicious PDF — malware analysis report

Static analysis result for SHA-256 178826d565b6b53c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 02:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228fe5e2cfc73267c3e4bd1e2e530217 SHA-1: c699261eba81432c48d51cb71a8df9a82fa82cdf SHA-256: 178826d565b6b53cc2e956c032fd04155d790f3af033863ade570abadadb1c2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or SEO spam tactic. One of the primary links directs to a known malicious redirector, ttraff.com, suggesting an attempt to lead the user to malicious content. 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.com/wix?keyword=reduce+cheeks+exercise
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_00d44119059045af8d821055747431c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb14eaa8021b4ea0883159d0c61abaf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bddbc0c184c4f569ac293a086fe92a0.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/mack_truck_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/40293752109.pdf
    • https://cdn.shopify.com/s/files/1/0430/2582/5955/files/vifujemurekonusi.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9abba6067f14abaa91de48c8a82056d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1378105b1452451aa90b44311c904eac.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7ebcd445e74058885c7f8dd977fa4d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006478.bin
c9666d921d64bf95e782c539ee4f05adf280b89771d57b0792f0b6580e0ed8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 4924 bytes
font_01_sfnt_off0000752d.bin
9524040c2c1630c1ef7596a3143da6043043cfcbf7a3e78c9cd45f6af3e85851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752D 10440 bytes

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