Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ec805cff139eab…

MALICIOUS

PDF

70.7 KB Created: 2020-05-16 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4745debf33abb8c2bbd4df462b0cd8c SHA-1: 1626a40ac65036e0e3c90f74dfcea5de6bddca2a SHA-256: c8ec805cff139eab01238fce9521a04a344abf3dd59f78e8fe10fb4e966d7b47
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a pattern of numeric slugs and are hosted on unrelated domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though partially garbled, contains text related to 'window shopping' and 'questions and answers', suggesting a lure to engage the user and direct them to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://aogdemo.site/uploads/1/3/0/7/130776025/130776025.html#gawain+4+window+shopping+pamprosesong+tanong+answer
    • http://cjministry.org/uploads/1/3/0/6/130639380/tepewoli_pejugibusofedu_rolumu.pdf
    • http://washer-dryer-repair.net/uploads/1/3/0/7/130740191/7f37eac0.pdf
    • http://eurolotto-biel.ch/uploads/1/3/0/4/130488983/2c4fee38cc.pdf
    • http://t2aerospace.com/uploads/1/3/0/6/130604175/8c81efa40742f.pdf
    • http://southlondonparanormal.com/uploads/1/3/1/4/131453288/068d1ca.pdf
    • http://thetaxclinicofbaltimore.com/uploads/1/3/0/5/130551700/8e4ee.pdf
    • http://atheart.us/uploads/1/3/0/2/130287995/8467800.pdf
    • http://financialjusticedelivered.com/uploads/1/3/1/6/131637830/8792661.pdf
    • http://ivyheightschurch.org/uploads/1/3/0/5/130546385/451a6a20195f71.pdf
    • http://mphotogroup.com/uploads/1/3/1/6/131637357/saveri.pdf
    • http://tennataxi.com/uploads/1/3/1/3/131379012/d0d72122d2.pdf
    • http://redgumtrading.com/uploads/1/3/0/4/130488067/8787952.pdf
    • http://jasonjoelharris.com/uploads/1/3/0/8/130874007/08f6b47.pdf
    • https://tvtropes.org/pmwiki/relatedsearch.php
    • 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_off0000dd14.bin
90e1805a50fb900449b255d00d514ed1a99b0e385c9a3cb226ac09ee78a525ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 2380 bytes
font_01_sfnt_off0000e786.bin
af65ebe60d53034dbf746ce08a7b3b026cf8e8fe4746e3bec68b1de3033753b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 11480 bytes

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