Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cd6ae06bd02188…

MALICIOUS

PDF

41.4 KB Created: 2020-04-25 06:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a28abb4403368f67358f32a1657ac1b SHA-1: 1ad333518cc9b4a6fbce7b9964230526424135e2 SHA-256: b9cd6ae06bd02188111d9bbe808593aef71252dd79ebc805edb2222fc7f5a278
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, suggests a lure related to 'Silicon Valley episode guide season 4'. The primary attack pattern involves redirecting users to these external URLs, potentially for phishing or malware distribution.

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://beyondthebackcountry.com/uploads/1/3/0/6/130604129/130604129.html#silicon+valley+episode+guide+season+4
    • http://antonia-seale-ceramics.com/uploads/1/3/0/5/130551777/vobup-wupusan-sotoliwitexavok-wazawixokegewa.pdf
    • http://doublekdorpersheepranch.com/uploads/1/3/0/5/130590366/3768616.pdf
    • http://rockyourmindset.net/uploads/1/3/0/5/130551704/wajekekabodiliz_jebadodoj_xifenogetube.pdf
    • http://immediateinsight.org/uploads/1/3/1/0/131070054/fd5f7.pdf
    • http://josephnjames.com/uploads/1/3/0/5/130590666/3208673.pdf
    • http://harbergfamily.com/uploads/1/3/0/2/130288507/vofitunoxujis-bufobula-gobiteraw.pdf
    • http://weplaysotheycan.com/uploads/1/3/1/6/131606256/sizoxiliwikeb.pdf
    • http://catholicedforall.org/uploads/1/3/1/3/131381976/zemej.pdf
    • http://drjuris--office.com/uploads/1/3/0/6/130604694/7710637.pdf
    • http://leadingtodaysyouth.com/uploads/1/3/0/7/130775791/5218950.pdf
    • http://paradisezion.com/uploads/1/3/0/6/130621456/pitotazeledunu.pdf
    • http://imprintstore.ca/uploads/1/3/0/3/130313445/9521620.pdf
    • http://firstholidaytours.com/uploads/1/3/0/5/130588513/zivekiwon_zatebebovezu_siwepezajajiwas.pdf
    • http://totcentsblog.com/uploads/1/3/0/7/130738781/60ee618c236bc0.pdf
    • http://gamemasterj.com/uploads/1/3/0/6/130639997/texakimi.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_off00006c3c.bin
955f758baf6fac5ba906e8b27ef6090d8f8601a3fa9e9eb0d32139f1d1600d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3C 9268 bytes
font_01_sfnt_off00008dc9.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 2652 bytes