Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f80845e1bf1ca4…

MALICIOUS

PDF

63.3 KB Created: 2020-08-13 22:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f765d08137d7779fd18c53e55d46dd0f SHA-1: 403190c0b69d5f7a9c24821acb653027c79769a4 SHA-256: 57f80845e1bf1ca4127a63e9cc1a37ebfcf08c7241f1e44b566400b28bee12d4
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains that host PDF files, suggesting a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body contains garbled text but also includes the URL that triggered the malicious redirector heuristic, indicating a lure for users to click on potentially malicious links.

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=apache+directory+studio++windows
    • http://files.theseriousmusic.com/uploads/1/3/1/4/131453526/ec34a577a74.pdf
    • http://files.heiligeschlange.com/uploads/1/3/0/9/130969907/4595536.pdf
    • http://files.birdandblossom.com.au/uploads/1/3/0/7/130739558/tobetuxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/introduction_to_modern_cryptography_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/how_to_save_gimp_as_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/28592255854.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/28119236588.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/erich_fromm_budismo_zen_y_psicoanalisis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/install_xgboost_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/wirorukelevivateruzogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/coumadin_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/tunepagoligiwenilijuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/set_theory_questions_and_answers.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_off0000aca5.bin
a1bee241c1c080f82db5429777bf84dce09e4dd500a947462fac2fc47b627eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA5 5312 bytes
font_01_sfnt_off0000bebd.bin
5f37e408193a283976737f1e527cbf31170adbdba443a71a35c5a3420b20f1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 15960 bytes

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