Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5d8f78ecaa88c2…

MALICIOUS

PDF

35.7 KB Created: 2020-08-29 14:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32b0ef080eaaa74e5a24b53bd7703516 SHA-1: b95f2f84a509ad5e3d88131501cc35149dcd56ff SHA-256: 3b5d8f78ecaa88c293df5f5ecfa59b7ea9f8def8d01295fa3f07ed079d35813c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL and a title suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute 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.me/wix?keyword=100+of+the+most+beautiful+piano+solos+ever+review
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/romir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3061/files/accounts_payable_document_retention_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/gusew.pdf
    • https://cdn.shopify.com/s/files/1/0455/7858/4229/files/53750119057.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d0ad2249c844cce9495c18dbbec8466.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6098a780084613aac26b7d57425968.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3231aef4ee41f991438e683adcb6bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac0412b987584be683eb3296dac60c33.pdf
    • https://static.usrfiles.com/ugd/b8c837_34fa6af42e7b403eb7b92b7bac34a2cf.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/the_process_auditing_techniques_guide.pdf
    • https://cdn.shopify.com/s/files/1/0464/6086/2632/files/wuzitev.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_off00004cac.bin
9834fc40309947f9c5dadc0a9333a0fd1cb8e11a63d2cd06cf551c2bbe94144d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAC 5532 bytes
font_01_sfnt_off00005f63.bin
c29f503b99ccbaf41ae1375972eb3e1a930f4fd227035dad42a5f41d062baebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F63 10368 bytes

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