Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f078b00c98e128c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8bd92de8b7bf3c17b67350c3b847778 SHA-1: 6439c5bd458538413f3160a5002918860f7c2c29 SHA-256: 7f078b00c98e128ca647dd352bcb243b1861bf9355451cc0d2b43d5b0dffb016
150 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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links but likely serve to obscure the malicious one. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and a benign-looking PDF filename, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/wix?keyword=the+doctor+blake+mysteries+family+po
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/american_english_and_british_english_words_that_are_different.pdf
    • https://cdn.shopify.com/s/files/1/0435/6718/6079/files/c_language_basic_objective_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/icap_examination_form.pdf
    • https://static.usrfiles.com/ugd/b8c837_90644722b4944c36be91780c1542a9de.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba279458667455ebbb32874e2a526c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8d09d64e3d64adf9f5765c94e69d790.pdf
    • https://static.usrfiles.com/ugd/f0e51d_45250afbd90f42b6b53161e3dfac4325.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/18f527_c5daa693e4d54ed89da6d9e576adb9b7.pdf
    • https://static.usrfiles.com/ugd/33a16d_df215778e3ff4b3ea35564a15a0127bf.pdf
    • https://static.usrfiles.com/ugd/76156b_3c1b90d65c5f43e5bf9a27f1451f10cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bcdf4e5c09640b0a4409c552cea4669.pdf
    • https://static.usrfiles.com/ugd/b8c837_03cd2da1f9fc42399650b944f5b7e15d.pdf
    • https://static.usrfiles.com/ugd/f65518_33b597ec6ef642eeada8efd508c83225.pdf
    • https://static.usrfiles.com/ugd/d17951_b9ab3b113520443da5c36f4982639703.pdf
    • https://static.usrfiles.com/ugd/5cf23b_bc1898e9c83e4313a009d4ebe3234a67.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_7ff70b4ae43d4c47ba21eb40389f3a10.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_off00007044.bin
e5f489134dd8cdb4e3f6d33a8dcedc5be93b3fdb8e49aa7a6c105438ad67547b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 5648 bytes
font_01_sfnt_off00008357.bin
b8cc24d7a8bf1e4885246ec299937999e8307c8028434c0a522f1b6bd8690a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x8357 9928 bytes