Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918dfb5524b16e8…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5114d83fe9349c36417310a4d55b66 SHA-1: 48270952beeb80836cf1c4e7ff92b1349c6c1942 SHA-256: b918dfb5524b16e879d923b54027c266c92e14d3868f87839d133be6fa06118d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a wholesale assignment contract. This suggests a phishing or scam attempt to redirect the user to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment.

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=wholesale+assignment+contract
    • https://static.usrfiles.com/ugd/b8c837_ae03b30485084813961b24a2ed935480.pdf
    • https://static.usrfiles.com/ugd/0d002d_336bbf96535a4b2c8bd0d1622dd431d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_173c99e94a0640a4accc19156c7143b8.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/vokivugikamixegavoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/complete_beatles_recording_sessions.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/latogumidufuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/siguzorisen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/structural_analysis_hibbeler.pdf
    • https://cdn.shopify.com/s/files/1/0431/0656/6306/files/mepikumida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/biozone_level_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1848/files/sekafagusis.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_off000071c0.bin
6985fe2b7aa348b4ca30246e4c13cf1e5ecc6602f9da9beb92172f8c38ff1de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5228 bytes
font_01_sfnt_off00008362.bin
d9dfe77a2a668b2d8d298441bf7656d2c708eeea5b4bc83b28d146becf030834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8362 10252 bytes

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