Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af9f04d00146a2b…

MALICIOUS

PDF

52.3 KB Created: 2020-03-07 16:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0440255dc4aca63403a8ea0aef8ab3e6 SHA-1: 2beee6351ac043ecf4bde5a10c96b2ef00e9021e SHA-256: 6af9f04d00146a2b5661719e9ce37fa908e1810ca51f7f67c2571a22c19b22b5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, forming a link farm designed to improve search engine rankings for terms like 'Adobe Premiere Pro CS5 full crack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to drive traffic to potentially malicious download sites. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

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://74-123-79-15.mgwnet.com/uploads/1/3/0/7/130776327/130776327.html#adobe+premiere+pro+cs5+full+crack+64+bit
    • http://mezzosoprano.site/uploads/1/3/0/3/130323411/dukaki.pdf
    • http://mapdrone.com/uploads/1/3/0/7/130738841/raxukamezumuzofav.pdf
    • http://acoloradorealtor.com/uploads/1/3/0/2/130288483/3df2a9dce136c.pdf
    • http://ww.royalanimalhealthuniversity.com/uploads/1/3/0/9/130969300/7621118.pdf
    • http://donnarandel.com/uploads/1/3/0/6/130605161/40fc77803.pdf
    • http://thecraft2draft.com/uploads/1/3/0/6/130621373/jumanudu.pdf
    • http://holycowchocolate.com/uploads/1/3/0/7/130775440/2332573.pdf
    • http://monolithcomputing.com/uploads/1/3/0/3/130313459/0ba7af.pdf
    • http://webdisk.luzcarmenboutique.com/uploads/1/3/0/7/130775961/gujito.pdf
    • http://annaravenscroft.com/uploads/1/3/0/3/130313145/manojikaxobet.pdf
    • http://musake.net/uploads/1/3/0/5/130588445/fifidege.pdf
    • http://courtbernstudios.co.za/uploads/1/3/0/3/130323659/tedifapudapes_begiwefevu_weber_sapimubewit.pdf
    • http://ingridsolbrig.com/uploads/1/3/0/6/130639839/vexeda-torugo-xopajofukovadi-lufenan.pdf
    • http://zhonghuayulechengdubowangzhan.f18.ebkf.org/uploads/1/3/0/2/130288383/vigewew.pdf
    • http://inceptionsdesign.net/uploads/1/3/0/2/130289784/8172265.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f70.bin
8d675c5e6986182ee3aeeafc6960b7b63f1aab67ce4c919e5da3890000218d06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 10960 bytes
font_01_sfnt_off0000a282.bin
c7e646ebbc790580a9ce381b3a09bfa14e8ad04f9e908b3fdf980173e662ddfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xA282 23180 bytes