Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21d9a35828234f…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 13:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be27a2fa637c2229da107e91529a46b4 SHA-1: 30aedca31413722e5d737c021d4dde7d810ffd13 SHA-256: ef21d9a35828234f322f49098eb246afcaf0c7b338a8cbbdceb67eea8875231a
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.ru/pify?keyword=financial+accounting+theory+and+practice+pdf'. This URL is presented within the document body, suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious intent appears to be redirecting the user to a harmful external resource.

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.ru/pify?keyword=financial+accounting+theory+and+practice+pdf
    • http://files.fritzassociates.com/uploads/1/3/1/6/131636654/jijus.pdf
    • http://files.laurawild.com/uploads/1/3/1/0/131070559/7747481.pdf
    • http://files.tjplumbingsuppliesservicellc.com/uploads/1/3/0/7/130776607/jepobusijugasizifav.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/nopexez.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/nomutejiwabaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33647917740.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6821/files/23047782950.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/coleman_powermate_maxa_5000_er.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/fur_elise_piano_sheet_original.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/suramiguzakekusonev.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/wupazet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1275/files/xizoxodazukosupugab.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/23009915693.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/liwezugaligiwik.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/allocation_apportionment_and_absorption_of_overheads.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/panunirike.pdf
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/nawarubomasuxonimuxesiwu.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_off000074e7.bin
5e937b6c1352f7adf0926913ab54c189113da8f8c2356b02f8a97396637071d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 5296 bytes
font_01_sfnt_off000086ee.bin
074714d2a8dbfda55f738b2fcfd23294af9b2ff4469d7c612eebff4b397338cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EE 10448 bytes