Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f950c3d229fd61…

MALICIOUS

PDF

33.0 KB Created: 2020-08-20 03:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd7dbfc7ebea80f30d8dd1f37bb7eb9 SHA-1: 5346e46658e654939c14524fc8ec5f6b5033fd65 SHA-256: f1f950c3d229fd612b757dd9a9cd0e38f34afbffc0c1b24f18de24560dcadafc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=astrology+books+pdf+in+tamil'. This indicates the document's primary purpose is to redirect users to potentially harmful sites. The presence of numerous other embedded URLs, many linking to PDF files hosted on Shopify and other domains, suggests a link farm or SEO poisoning tactic to increase visibility and traffic to malicious destinations. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=astrology+books+pdf+in+tamil
    • http://lukolor.katikatiponyclub.com/uploads/1/3/0/7/130775075/ac5dc7c4ad48c4.pdf
    • http://files.purimafoods.com/uploads/1/3/0/9/130968933/283fb.pdf
    • http://files.pittsburgseafoodandmusicfestival.com/uploads/1/3/0/7/130776374/42f30a85cdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4743/files/34392952022.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/mosafaserabarexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/16709606189.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/the_authoritarian_personality_adorno.pdf
    • https://cdn.shopify.com/s/files/1/0459/2238/6069/files/jojexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/zajamonebopunebemudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/rajatoxatokarepofeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/morokodanusexaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/7286/1848/files/82151170810.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_off00004267.bin
401ab34e2339ba49a620f80d9f93eb3ae770cbd0750543929d15a2a5751b1d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4267 5656 bytes
font_01_sfnt_off00005594.bin
77d52d9472295cdc32f66784760482467558888c026766d96e0b304c2ff5b8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5594 9556 bytes