Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa86112bc96b9aa…

MALICIOUS

PDF

32.6 KB Created: 2020-08-18 22:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c014d4c2d42732d2f3a514ec65a9a43 SHA-1: 60b6ef4a7d6e1d07ef063820ecd93dc64c87874e SHA-256: bfa86112bc96b9aa485639dce402bacd8cd70f922ef3fa7140ea692fd7093cd3
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=america+del+sur+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, but one notable suspicious URL is 'http://depexolu.tah3.com/uploads/1/3/1/6/131636725/2532197.pdf'. The document body, though heavily obfuscated, contains the suspicious URL and appears to be a lure related to 'America del sur worksheet'.

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=america+del+sur+worksheet
    • http://depexolu.tah3.com/uploads/1/3/1/6/131636725/2532197.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/31989180196.pdf
    • https://cdn.shopify.com/s/files/1/0429/8473/4883/files/dupebowugepukuvivok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/wowomojonixojitoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/zofabosofozaviruvuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/51742034441.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/lejapoluxabakikakat.pdf
    • https://cdn.shopify.com/s/files/1/0460/3189/6740/files/chacha_meet_new_app.pdf
    • https://cdn.shopify.com/s/files/1/0444/5070/9671/files/fafsa_student_loan_deferment_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/nozatodijixixipamuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/how_to_paint_basement_ceiling.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/48390276139.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/graphic_design_courses_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/57461091976.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_off000042a1.bin
79c704701013784c71ee03e8f04b5ede5e51929e5bcc22a3f0fbb8dcf4bd0533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42A1 5324 bytes
font_01_sfnt_off00005497.bin
1ff6503b2f4ea04d6215ceb536e53171d889fceb8e41b55f9de0e91d4da23429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5497 10028 bytes

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