Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7210cbae78b2e9f…

MALICIOUS

PDF

49.1 KB Created: 2020-08-24 00:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b012455a81388b9be9dd1a07440d09 SHA-1: 621d3ef4bb456413544fdb87dd47ca656e4b2160 SHA-256: c7210cbae78b2e9fbc032154cd1540c033e4ac23722e8b750f6315e8975f5bf2
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=frozen+shoulder+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=frozen+shoulder+pdf
    • http://mukor.cogophempstead.org/uploads/1/3/0/7/130738837/renowibivarozut-tifupalen-dipunase.pdf
    • http://files.la-fll.org/uploads/1/3/0/9/130968935/2817256.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://files.tedwilliamsiii.com/uploads/1/3/1/4/131438046/b4a37dd5b162f6e.pdf
    • http://files.passionfordiscipleship.com/uploads/1/3/2/6/132681153/72b7f87318.pdf
    • https://cdn.shopify.com/s/files/1/0449/6962/3711/files/popekuvidaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/journal_marketing_research_articles.pdf
    • https://cdn.shopify.com/s/files/1/0445/8476/3556/files/que_significa_languidece_segun_la_biblia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/sexurepabapisadosegovader.pdf
    • https://cdn.shopify.com/s/files/1/0462/7736/1813/files/wagiforozajikov.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/20519128773.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/you_can_win_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/lajodewufukewibiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/vetokabebedinuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8076/files/tratamiento_de_rinosinusitis_cronica.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9285/files/all_chemistry_formulas_for_class_11_and_12.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/vadimimirumuzivariju.pdf
    • https://cdn.shopify.com/s/files/1/0463/2500/6491/files/best_free_compass_app_for_android_phone.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083bb.bin
57224b0008e8d9e348f4c921ef6d31db10d3f0ed580e9986dce8aa411ed5e898
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 4924 bytes
font_01_sfnt_off00009478.bin
966c5d5e46b32951c8755e7cc833b008c8e1aaf2890877ec3133cd61a3647689
pdf-font-stream PDF embedded font (sfnt) at offset 0x9478 10136 bytes