Malicious PDF — malware analysis report

Static analysis result for SHA-256 335a85e01efc5cd7…

MALICIOUS

PDF

48.5 KB Created: 2020-08-23 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fad9ca192016d107ac48367b2d13396 SHA-1: 74ece17456d146ed0d1c5e21c23c7bf2adbce67c SHA-256: 335a85e01efc5cd7a88e9ea8ef9b5217cc88932ba00b57ad80b58fbecfc9189a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the text 'Advanced accounting mcqs with answers pdf' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of numerous Shopify links, some confirmed benign, may be an attempt to blend in with legitimate content.

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.cc/pify?keyword=advanced+accounting+mcqs+with+answers+pdf
    • http://files.alleannaharris.com/uploads/1/3/1/4/131411281/lorizelit.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/a_l_u_ki_full_form_bataye.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/margaret_atwood_the_testaments.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/88544224709.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/72092064341.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/5579100014.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1472/files/zensar_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/5346/4214/files/55025030712.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/bungsaufgaben_buchungsstze_mit_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/cavernous_malformation_spine_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/mibokaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/wunonete.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/vepufelujewojedajela.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/little_star_standing_egg_piano_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f79.bin
6ed037e02a94280eaad14801c4595ae3ff3821e9c86461e09950ec6167ac699a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F79 5688 bytes
font_01_sfnt_off000082ac.bin
8c12fd94014e17e53f4b6d2eeda09f321580c00188945eace172fab48ddf7b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x82AC 10908 bytes
font_02_sfnt_off0000a6a9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A9 4324 bytes