Malicious PDF — malware analysis report

Static analysis result for SHA-256 275015fb4232788b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 23:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad4e6fe00aa3ec79d702b7452e76c6b SHA-1: 1ceb22d8da010f50f7234b375ba0bba792fac6bc SHA-256: 275015fb4232788b443f48bf0857b72899089213fccaead466b1105f29d810f5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=arterial+blood+pressure+monitoring+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious 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.ru/pify?keyword=arterial+blood+pressure+monitoring+pdf
    • http://files.dogoodstore.net/uploads/1/3/0/7/130776249/vibubokisexan.pdf
    • http://files.buttecollegebcea.org/uploads/1/3/1/4/131453998/2695778.pdf
    • http://files.counterearthgrid.com/uploads/1/3/1/4/131453989/01ba145147b0.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/windows_7_pro_oa_download_hp.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/podijidikutesuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/lobufojiteb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/56923285563.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/perimeter_of_polygons_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/55495469030.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/sirogipov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/wefuwulududinul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/95897016044.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6600/files/9391147617.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/divinity_original_sin_2_nude_mod.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_off00006393.bin
193cb002929a62a11ef8078fdfc4c179d548029f5ce766650090f2e260af8f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6393 5492 bytes
font_01_sfnt_off00007626.bin
675fd02f8eb831df4c8a704a339822f702d9e54258d0f8b7f53cc0b50501f934
pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 10256 bytes