Malicious PDF — malware analysis report

Static analysis result for SHA-256 324b998e3f63a8ac…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 02:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2489b1139d3134d8ea9093a8b0c8dc SHA-1: 3aa4e40d77b1a4f9cca72fe5ff18f7cb3e0bb50c SHA-256: 324b998e3f63a8ac3a96a54e6b1f582b09284d70871e71f73cf4cf02d16d5392
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded links. A critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=aao+raja+song++full+hd'. The majority of other links point to Shopify-hosted PDFs, suggesting an attempt to create a large, interconnected web of links. The ML classifier strongly supports the malicious nature of this PDF.

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=aao+raja+song++full+hd
    • http://files.custommailservices.com/uploads/1/3/1/4/131455198/vawodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/65978174713.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/45955858449.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1958/files/bosusogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/dupelopifivezesagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/9455364896.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/mesh_to_micron_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/ivtl_infoview_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/98300176478.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/26294132720.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/kiwagutawazufitawejikugez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/tidudojowunamimunugupe.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_off00005137.bin
f65cabf149cba0a0381a9e23a66a624fd6259fa601cb6539518095d1600a4fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5137 5232 bytes
font_01_sfnt_off00006300.bin
82177c272a12a0b9e3c68cd526a542c211b23ee8ae0a2ac18f0b568a5aa72559
pdf-font-stream PDF embedded font (sfnt) at offset 0x6300 15392 bytes