Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ac0912a4329a0d…

MALICIOUS

PDF

38.0 KB Created: 2020-09-02 00:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c072589dcde7e300e5bfc0ab566d4b91 SHA-1: b8a7d58a3b3fb8e05731112504a337d64829af90 SHA-256: 51ac0912a4329a0d2872531ad54e854949c4b73da53506cbca1aaf00d4d1f2ca
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=federal+ballistics+calculator', is designed to lure users into clicking it under the guise of a legitimate calculator. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and redirector are clear indicators of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=federal+ballistics+calculator
    • https://static.usrfiles.com/ugd/f3ecbe_1ef2f7ea9c474b14bb167012a6663e96.pdf
    • https://static.usrfiles.com/ugd/544e7e_db9a6fdebba449418425f05cb1a3cb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_8391d399524e49a5851cc79f6c8e9f19.pdf
    • https://static.usrfiles.com/ugd/3aee12_815a206480d748139d01f82f83fe2206.pdf
    • https://static.usrfiles.com/ugd/b5472a_b21b9e2751244280ad923b172be8d81a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92c904487cc4e9981450bb482de60a9.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_6fdebced452f4f9fb0b7a3f3347ef651.pdf
    • https://static.usrfiles.com/ugd/89c6ad_11fd8535e26245ed9e8867aa684d20e5.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/zofubuwiwulinikoveje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1858/files/lawn_mower_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0435/9634/9602/files/nurseslabs_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/sitonesemogikiz.pdf
    • https://cdn.shopify.com/s/files/1/0459/2287/7591/files/58220609750.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/tadijexogo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/vizonakenaxatojix.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_off00005744.bin
66a480e46a63f28d5f95180f6cff00d006ac38d10faf6cafb609d4366d136f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5744 5028 bytes
font_01_sfnt_off00006863.bin
7d28c8cc83f5af1eaff825fa2042b69df164a310c984a4c4ff14c42d7e13a65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6863 10256 bytes

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