Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda0502c0609fede…

MALICIOUS

PDF

32.4 KB Created: 2020-04-06 02:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d22c382260990bc275e4a212721310de SHA-1: 72dbb3d7a8a926db2e7191e7b59325155c40b70f SHA-256: bda0502c0609fede86c6b9196c486fbc661bb425f532be397a6fb1e0bc652c7a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The primary goal appears to be directing users to a network of potentially malicious or spam-related content.

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://block1949-asu.com/uploads/1/3/0/5/130589042/130589042.html#dimensional+analysis+practice+problems+with+answers+pdf
    • http://tinysoaps.com/uploads/1/3/0/6/130605237/kujezuboputesavuke.pdf
    • http://heatwavehits.com/uploads/1/3/0/3/130379814/gosawamoxo.pdf
    • http://getgreencollective.com/uploads/1/3/0/2/130272072/benomesumib.pdf
    • http://rnnext.net/uploads/1/3/0/7/130776211/1487572.pdf
    • http://roygbivcreations.net/uploads/1/3/0/6/130639569/tokilig.pdf
    • http://www.somasoakcanada.com/uploads/1/3/0/3/130323285/lopefesifip.pdf
    • http://summercourt.biz/uploads/1/3/0/7/130739952/motuzinom.pdf
    • http://montgomerycountyhumanesocietync.com/uploads/1/3/0/4/130476308/jewuxavimatidax_fegevelibebig_lepelajikuguval_dovurafiweref.pdf
    • http://willmenard.com/uploads/1/3/0/7/130738621/pokibokifalo.pdf
    • http://lawtonfirstnaz.com/uploads/1/3/1/1/131163898/156ee65ae7.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_off000054be.bin
ba8f92e7d836a596f81a2f9ca7f0a9ee52dacac06a2bc4292f089cabfa07fbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BE 7756 bytes

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