Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbaf46e61b9051d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 19:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b50baae02a697b11892d5fc5f410b2 SHA-1: 5edd60b964b672948730ce021addbbceccfd5d15 SHA-256: 4cbaf46e61b9051db94bfcb8aa94dd649ef08d927599e439b8e6d2f47a039883
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com, likely as part of a link farm to improve search engine ranking and lure victims. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful content.

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.cc/wix?keyword=chapter+19+to+kill+a+mockingbird
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/alacakaranlk_5_afak_vakti_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/tawowugevovetuwev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/96172360580.pdf
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/mugikalamerolorijevesewiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/momakilaxirumodobujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/27196731065.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/22725033133.pdf
    • https://cdn.shopify.com/s/files/1/0462/1303/8233/files/endothermic_and_exothermic_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/sororanodomebu.pdf
    • https://static.usrfiles.com/ugd/b8c837_a510631e1bd34398915a53193dc1429b.pdf
    • https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.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_off000068d9.bin
bc5127f5693ff2cb56766dfbaa50e74b2b293d945cbb369794487899c263785d
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D9 5628 bytes
font_01_sfnt_off00007bd0.bin
e03796694caa7085f45cfe7f1d402358597af6f7629c4b5fe18715affa11573a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD0 9868 bytes