Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ef4c4cd89a80bb…

MALICIOUS

PDF

49.8 KB Created: 2020-08-21 21:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841804f7b49219dfe66d8c018aeab09b SHA-1: b26827af6c4d07dc252283b3dc68d2a5179e3cc0 SHA-256: 23ef4c4cd89a80bb87a3251caf16748ab27bb392e65065756b06df24515a958d
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=sujet+brevet+2019+math%25C3%25A9matiques+pdf`. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs, including `https://cdn.shopify.com/s/files/1/0429/0006/2367/files/zenith_bank_aptitude_test_questions.pdf`. The document body, though partially corrupted, contains text related to exam preparation, suggesting a lure to entice users to click the malicious links. No scripts were extracted from this sample.

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=sujet+brevet+2019+math%25C3%25A9matiques+pdf
    • http://zonefiv.maxinewade.com/uploads/1/3/1/8/131857314/gisuxosuxeg-foduwizedos-mozaxituf.pdf
    • http://files.fishreeladdiction.com/uploads/1/3/1/4/131437306/276172.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/zenith_bank_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/gesoludozuxojemixof.pdf
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/bexemonepaxiwiledaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/25723855604.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/sample_business_plan_software_company.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/90254710193.pdf
    • https://cdn.shopify.com/s/files/1/0440/7705/6165/files/pijeterir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/zemokomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/46092520919.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5f.bin
be89c6da5b69e8a70b986a27a7251a21b3c44b3a429c7d68d4eaa2a43891246a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 6376 bytes
font_01_sfnt_off000074ae.bin
87f4dc9fc1dc24012f317389c1eb0370a9430534078bbe5b7f9ba8065666d42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AE 1956 bytes
font_02_sfnt_off00007dcf.bin
993b3b49531b406937d6cb149ebef7861b0d7f7ef184c84b1e3fc7e56b1b054a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCF 11512 bytes
font_03_sfnt_off0000a343.bin
c33faafd911d2c4e8fea0807a017527063dea1be9a25b30e85ccf6f7667e82b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA343 16076 bytes

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