Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6e29f62a846aba…

MALICIOUS

PDF

43.3 KB Created: 2020-03-14 19:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2ad787dfa0d6cadf882bf3740a44cf8 SHA-1: a793f3f4f26574693a270e8eb710be62b8002804 SHA-256: 3b6e29f62a846aba27559f6b8846ae0c6ca34f975aca9a77b437b61324948bd2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'Spider-Man far from home colouring sheets'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports its malicious intent. The primary goal appears to be driving traffic to a network of linked websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://tuijian.bpmtc.com/uploads/1/3/0/7/130776367/130776367.html#spider+man+far+from+home+colouring+sheets
    • http://autodiscover.dr-mug.com/uploads/1/3/0/6/130605228/6351241.pdf
    • http://imedspine.com/uploads/1/3/0/7/130740252/2576908.pdf
    • http://fbcharvard.com/uploads/1/3/0/4/130477252/7a833369a05ce.pdf
    • http://softwarehabits.com/uploads/1/3/0/2/130288401/5397107.pdf
    • http://beta.trestl.com/uploads/1/3/0/2/130289283/5583704.pdf
    • http://mtziongoshen.church/uploads/1/3/0/7/130739223/5452010.pdf
    • http://breckgear.com/uploads/1/3/0/7/130738769/narebe_muzubomabejiju_tubosinizada.pdf
    • http://devweb.org/uploads/1/3/0/5/130588349/nasumuwiwoloriw.pdf
    • http://pragmaticallyspeaking.co/uploads/1/3/0/6/130620849/e94a92315e6.pdf
    • http://drywallnewmarket.com/uploads/1/3/0/6/130639230/dafoxelijus-tegaseruw.pdf
    • http://mx.myvirtualvacations.net/uploads/1/3/0/7/130740212/bisolopinejekal.pdf
    • http://laurienommsen-rivers.com/uploads/1/3/0/8/130874398/6619238.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081f0.bin
f217cce5ae9848dbe7c3b7f79f2efb8e92c259f3bda11bb6fb45570c4c04a85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 7892 bytes

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