Malicious PDF — malware analysis report

Static analysis result for SHA-256 a401922f2a469fa7…

MALICIOUS

PDF

37.2 KB Created: 2020-08-16 22:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2f2bface40be3428699280702bf9f22 SHA-1: 4539e938cafb27f3a7ea783e05418f480854c981 SHA-256: a401922f2a469fa76043539fece0a05d9e2fc5ff1b9daf207928899825c04fff
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=bring+me+to+life+flute+sheet+music', is presented as a lure for sheet music. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and link farm suggest a delivery mechanism for further malicious content.

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.ru/pify?keyword=bring+me+to+life+flute+sheet+music
    • http://files.kindredgardens.net/uploads/1/3/0/7/130739742/rubavokujajeluf.pdf
    • http://files.westhawthornuniting.org/uploads/1/3/0/8/130813042/bumubikikivudan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/81377115102.pdf
    • https://cdn.shopify.com/s/files/1/0440/8243/0117/files/facebook_lite_old_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/54287856069.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/19914529107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/14544361062.pdf
    • https://cdn.shopify.com/s/files/1/0443/2792/7964/files/composite_materials_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/75668889067.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_off00004b96.bin
10acca37ed30a582aa9a082f180d0d703eea906b6bf7e351a1b2083fe6d2f434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B96 5136 bytes
font_01_sfnt_off00005ce7.bin
b25442c40a03780b38090ddafe3458521033c0597247987f5c932fe0a8b2db03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 13980 bytes

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