Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa2f1fd16878f16…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 05:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c738f1cb5d53a9d12f8a692dc2b1db17 SHA-1: 686e05012fbc5e0d6f96e6e09a0265cc8cbfcbc0 SHA-256: cfa2f1fd16878f16e40df66825c4e6242821d04b2bda49ed5182abd5ed22e76a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting PDF files, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

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/pify?keyword=formative+assessment+strategies+definitions+examples
    • http://files.whatsonoz.com.au/uploads/1/3/0/9/130969426/soripubu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/bartlett_s_bisection_theorem.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/carmina_burana_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/89795815164.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/99262350436.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/67680477373.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/84787054724.pdf
    • https://cdn.shopify.com/s/files/1/0434/7671/3637/files/74596401707.pdf
    • https://cdn.shopify.com/s/files/1/0433/8843/6643/files/wumamakevilip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006062.bin
88c3b5672b2cf28b679b4be3e39054a64d22398a72ea30a9daee73ff3e9ac481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 5232 bytes
font_01_sfnt_off0000721e.bin
7e68feb0f9426717eb261832a77613ab233739e6cc399959470296b95cd69dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721E 9860 bytes
font_02_sfnt_off00009392.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9392 4324 bytes

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