Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cc12bee69d245d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 16:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e676383a07b4614d0e31e491f284b0f5 SHA-1: 7dd08042955f95a1aff04a47e2207250d9966909 SHA-256: 21cc12bee69d245d22755be84515e1f1765c743855e69e5110cef9f8cd68ecb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to watching videos. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector indicates an attempt to lead the user to a harmful destination.

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.com/wix?keyword=watch+paheli+with+english+subtitles+online+free
    • https://static.usrfiles.com/ugd/b8c837_469bdc7996e2437d98cc89df968115a4.pdf
    • https://static.usrfiles.com/ugd/eb4c03_712a8de2fc5042c4b9da30242dc119cf.pdf
    • https://static.usrfiles.com/ugd/6290de_a58554fe82124a0ca68d1d4ad4a3271e.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_c6e6918cae9d4794a550f69029d623aa.pdf
    • https://static.usrfiles.com/ugd/b6edda_7fe6c508694f4bc9b0f693132dd6b1a3.pdf
    • https://static.usrfiles.com/ugd/4c1554_28cd2132fc0a41908ebb738756dac45a.pdf
    • https://static.usrfiles.com/ugd/906e9f_0f23300643094e459c830ba7030631b5.pdf
    • https://static.usrfiles.com/ugd/921909_c8a87b2e99384c7b9a5e309ab266953a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f98e6001c74b458a874cf25bf729292c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/lusukumotasunawikuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/56661818053.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/votunitogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/translate_chinese_to_english_document.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/brushless_motor_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/3421/3543/files/watch_bleacher_report_live_on_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/panchatantra_picture_stories.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/2485205529.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054f3.bin
f0beb6ebf9f550277817cc413876b375d0f657199458697e0f5cc2ed729776d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F3 5520 bytes
font_01_sfnt_off000067c8.bin
7991cadd76f92a958d40ed9a9f94fd01758333bc1150115fe7ab8242b91dd7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C8 10636 bytes
font_02_sfnt_off00008c4b.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4B 16164 bytes

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