Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb66ce0c07140b5…

MALICIOUS

PDF

33.3 KB Created: 2020-08-31 09:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c50d9f21676e008992d31d0fddd8a7d SHA-1: 6bc7f2a2767e9b06d94beb2749b71113962f6416 SHA-256: 0bb66ce0c07140b56c33451afb75e53c9833bd5226fbb4eceb416a8d51110bae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains a significant number of embedded URLs pointing to external PDF files, a technique often used for SEO link farms or to distribute malicious content. One of the primary URLs, 'https://ttraff.com/wix?keyword=graphic+novel+rubric', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=graphic+novel+rubric
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/086daf_6eb0edfe180b425d9399739687ae135a.pdf
    • https://static.usrfiles.com/ugd/b65acf_1f44d261638d4dab9d190fa81850b226.pdf
    • https://static.usrfiles.com/ugd/89c6ad_066bb6b6479e4524a77b55ffb7f9d158.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/hawker_battery_selector_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/pdf_econometrics_solutions.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/77941b_398d2853bcb94158816e7a9efbc39b14.pdf
    • https://static.usrfiles.com/ugd/0e2875_9d4798e1813a43e1aa088819fd56046f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee56a1f1e6994cc096b493eadf3f2424.pdf
    • https://static.usrfiles.com/ugd/79cb75_b325f87b27d14669a2ba26a328eaa0e5.pdf
    • https://static.usrfiles.com/ugd/097bd5_06d15d73257e470e8dbb3d536a8f3618.pdf
    • https://static.usrfiles.com/ugd/f967ac_99a66376e8f94bfabe80e8f1d3fdb7ea.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e24c4e601de24204a0db39e8a4481ce5.pdf
    • https://static.usrfiles.com/ugd/c068f8_43dd445fd49743da9c626c1bf474851b.pdf
    • https://static.usrfiles.com/ugd/0dd040_2253574412ca4f36a819f2d733132912.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_off000046e0.bin
d94f129bf3e04f83f80ebdaabc40733563041b782e63d2ec78a918fc7d4d2952
pdf-font-stream PDF embedded font (sfnt) at offset 0x46E0 5076 bytes
font_01_sfnt_off0000581b.bin
71b078c3971f6f1f03348adbe9aae84021fb078216493266ab9a2cdcf28d1eda
pdf-font-stream PDF embedded font (sfnt) at offset 0x581B 9080 bytes