Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b49990bb3bbe36…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 00:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c678bdc127b5cccd7ca29439fcdcdf5 SHA-1: b380d8a6ab4bf9e9236d6a0bfae2e61e3ca01446 SHA-256: 31b49990bb3bbe36df0a5804aebf0b99d64c3439ab4347f67e3c8fe50328f64a
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. It also exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, likely for SEO manipulation or to host further payloads. The document body contains a call-to-action phrase and the malicious URL, reinforcing the intent to redirect the user to potentially harmful content. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=graduation+return+address+labels+free+template
    • http://fusagup.parkwayspa.com/uploads/1/3/1/6/131637240/8553236.pdf
    • http://files.chslibrary.info/uploads/1/3/2/7/132741241/ligoxogepexuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/creature_quest_kingdom_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/rebujari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/digabiwasude.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7006/files/vector_mechanics_for_engineers_statics.pdf
    • https://cdn.shopify.com/s/files/1/0437/4849/1415/files/goxarojokojok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6790/8004/files/alphabet_lettering_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/18064530599.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/dojupixafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/sinefare.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3534/files/81678246873.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/71743516266.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/6090568909.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/kasozuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6474/4343/files/tata_trade_apprentice_2019_form_date.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_off00004ebc.bin
82ef080f6b0e42c861505ee53072e5cd9c17afa27d035d59e60b0f378f0ba67b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBC 5240 bytes
font_01_sfnt_off00006070.bin
b6b2c86ebcfbf2a3bd66c3ffd67dfa687dbb48d8cb99c83c7c1007696e18b8b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 9632 bytes
font_02_sfnt_off0000816a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x816A 4324 bytes