Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae78f429e120c87…

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 03:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c744bd2e0e39f228c68c55b17461422 SHA-1: c93be7a8b399cd978aefd02715bc07dc7567ea11 SHA-256: bae78f429e120c87a4396a9cc09d1576c697f75bdb3a0502a77a425e77fe78a7
140 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 hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains text related to educational worksheets and the malicious URL, indicating a lure to trick users into clicking the link. The presence of a callback lure heuristic further suggests a phishing or scam attempt.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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=estimating+sums+and+differences+worksheets+grade+3
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/nomenclatura_amidas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/jesosapezafawaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/punctuation_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/video_calling_app_free_for_pc.pdf
    • https://static.usrfiles.com/ugd/a838c0_eda7818feeb54a999675c9bb98a82809.pdf
    • https://static.usrfiles.com/ugd/575363_94d71c102b9c4689b462bba7902eb077.pdf
    • https://static.usrfiles.com/ugd/9374a7_a02c8be9be38468cb957eded6e77c9d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fff4bfbdacf44f1586d74b3ede6e876b.pdf
    • https://cdn.shopify.com/s/files/1/0431/1118/6588/files/bakijenupusup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/48290360335.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/98990494025.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_off00005841.bin
f88ee5842546c12eb27642854ca921e72c9904dcfdc97125296d8d1905662dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5841 5680 bytes
font_01_sfnt_off00006b8c.bin
1dc66ee716ee2993eb0ab893eeeb875b708ebe95c938df6f253c4fb4e34893cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 10236 bytes

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