Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a7efd7ec12a02c…

MALICIOUS

PDF

34.7 KB Created: 2020-08-19 08:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b45323b7e9847145b735c2bd81837a SHA-1: 4f254b10bef76a2e881a7c43eca13c19682f484b SHA-256: f6a7efd7ec12a02c921ca002082965c60565bd733e778dc37dbe83c7c0fdd425
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. The document body, though heavily obfuscated, contains the same URL and a reference to 'prepositions of place exercises with answers pdf', suggesting a lure. Another critical heuristic indicates a PDF link farm, with multiple Shopify URLs, one of which is also present in the document body. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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=prepositions+of+place+exercises+with+answers+pdf
    • http://files.profilesbylynn.com/uploads/1/3/1/3/131398385/fcd3ff404e83.pdf
    • http://files.mmsoundandlighting.com/uploads/1/3/1/3/131379396/4521139.pdf
    • http://files.coastalleadership.net/uploads/1/3/1/4/131406498/nobodat.pdf
    • http://files.osbornelumber.net/uploads/1/3/0/8/130813413/308061.pdf
    • http://files.thegreensheep.ca/uploads/1/3/2/3/132303406/a54255fd28bc.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/tatikudulezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0428/1466/8959/files/12278459972.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/xupumojiguronetewowizag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/tudupowoxupowovazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/74749914568.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/7862506017.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/74167554491.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_off000049d1.bin
f414abee0d9c4b5b2cacbe8423873f8503d0d7eaa0fca57ad7bb172b3ec4ceb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49D1 5404 bytes
font_01_sfnt_off00005c32.bin
4d9eff4a369b542c50a5f708b937eedf3baf4ed5b96f8ecff55c0fba9decd8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 9868 bytes

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