Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acd67a27b11ddb0…

MALICIOUS

PDF

93.7 KB Created: 2020-08-08 08:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79265f2f4f91c755d131525f74f2ce25 SHA-1: b0ec824c015ace93da5b054ddd92cf99eab568aa SHA-256: 4acd67a27b11ddb09b3dcc556368f5fb9e5330305adda653c78a9f790c3b8d4a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chemistry+notes+for+ssc+cgl+pdf+gradeup'. This indicates the document's primary purpose is to trick users into visiting a malicious URL. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=chemistry+notes+for+ssc+cgl+pdf+gradeup
    • http://files.andrewtaegel.com/uploads/1/3/2/7/132712011/gezatomaw.pdf
    • http://files.christineprietoarted.com/uploads/1/3/0/8/130874339/1010004.pdf
    • http://files.ericaevansartist.com/uploads/1/3/1/3/131398281/1197094.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/befuwagunelalotupivu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/63595861785.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/zastone_d9000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/10472591797.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/napuwagogotegamesali.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/min_heap_java_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/affidavit_of_bona_fide_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/13934291608.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/financial_risk_management_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/zulobomigodukuveli.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/14842238435.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfd.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 1696 bytes
font_01_sfnt_off00010427.bin
ea7ca1ef6fec55e47236320962b5f6c8dc45bdbc0b7130c3e2bd95c2d8d9e017
pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 5576 bytes
font_02_sfnt_off000116f7.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 3720 bytes
font_03_sfnt_off0001225a.bin
33450220ad4aa1c936e2e44dd89c958211ad2f7b626cc1db5e1035bfb56268eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 13836 bytes
font_04_sfnt_off00014d67.bin
39122102f25ca625576f431391b80b7fe21e23e9d5f92f6081e520c5de605277
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D67 7940 bytes