Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c1f9ad080acf4f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-27 17:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4293258e948dd6e3c76075730c9fb1 SHA-1: 52dce1807b1a49afd59020843a5ec66fc09c3196 SHA-256: 61c1f9ad080acf4fc8c2dd469d65725608b586c95f50a62244e1b17a7ceb539f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.ru', suggesting an attempt to lead users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, likely for SEO manipulation or to host further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

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.ru/pify?keyword=call+shop+management+center
    • http://vaguvuwim.lapen.us/uploads/1/3/0/9/130969723/fd8a78ea43e4.pdf
    • http://files.princessmi.com/uploads/1/3/1/4/131483254/d2d7c681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/utorrent_not_connecting_to_peers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/present_progressive_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/2433/3472/files/anime_girl_dead.pdf
    • https://cdn.shopify.com/s/files/1/0428/5091/0364/files/complete_english_spelling_and_pronunciation_rules_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/vinegidiroxikiralujij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/nopukepafenegoxuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/86630407656.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/22073219905.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/wafurivoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/3302/5960/files/circle_theorems_worksheet_gcse.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8072/files/21443205851.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/voicemail_notification_won_t_go_away.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_off00005fff.bin
a8d83a40883ebffa3c08666a4263be43ea2aef8be64d2a8e7ef46ce80d7e6ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 5252 bytes
font_01_sfnt_off000071b9.bin
8937d89aa94d962b6978a873fcd3258bd6c178f6457d8c740d48d90451ed193f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B9 10792 bytes

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