Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5817b1dccebb367…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 09:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263a2cf3d5a8d3ef78b32ace380ee236 SHA-1: ede0a1da14c4e50ba7311daacf15042703956193 SHA-256: c5817b1dccebb3673703337050bc66872daaeefb20f9c3df421c90360ed3adac
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.com/pify?keyword=alice+in+wonderland+story+with+pictures+pdf
    • http://files.dottiesflourshop.com/uploads/1/3/2/6/132695629/lewebevodulu-vugiliji.pdf
    • http://files.paulreecephotography.com/uploads/1/3/1/6/131606392/56adf459.pdf
    • http://files.acouturelife.com/uploads/1/3/1/4/131453226/0701f.pdf
    • http://nesiweb.oldnytours.com/uploads/1/3/0/9/130968921/devixala_luwafegik_bifilipojifuru_xetobelebizez.pdf
    • https://cdn.shopify.com/s/files/1/0450/3748/6238/files/bartending_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/rupujigegejonuxewudupipip.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/50768795165.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zetobudowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/43693726489.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/30580795797.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/78916440267.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/38761492374.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/pubarixafat.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_off000067fb.bin
56450ed80e6c73c80b5764591c8ac014d44de48a46626ce73ce33d57a923279f
pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 5424 bytes
font_01_sfnt_off00007a7e.bin
2dd060d87261a8c4f61558a10040c59b5598fcdabc5cae1646481d2a7eb54108
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 10264 bytes