Malicious PDF — malware analysis report

Static analysis result for SHA-256 604efe87df2d94aa…

MALICIOUS

PDF

45.0 KB Created: 2020-08-26 17:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3482829eee043f41a8ac66a7d3097c1 SHA-1: ced3c6d48c0a342178a5a1f8676fe5cc85937f46 SHA-256: 604efe87df2d94aaf63ce539de22f90e95be7b3228389fa65f28479ab9073e80
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, as flagged by 'PDF_SEO_LINK_FARM', indicates a potential link farm used for SEO poisoning or traffic generation to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.cc/pify?keyword=aleksander+powietkin+wikipedia
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://bofododel.maineartsedresources.org/uploads/1/3/1/4/131453358/d3d45a897bdacd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/70115467367.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/53725993773.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/uphill_rush_theme_park_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/kulifaxonuguvufiruliro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/15486468917.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/xojupematonelip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/zugokevixarexorunamazi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2893/files/zopaniwumozogeletevikava.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007015.bin
3d9ddce0c5317d0c19f11af35c6f2c60aa9b338cc84d390e35c15984915477e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7015 5100 bytes
font_01_sfnt_off00008185.bin
25d9088c643aec26da853d45c4488054e16c1a2c53891262c9d2e1a5ee7b26ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8185 11492 bytes