Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31c6b712924c889…

MALICIOUS

PDF

40.3 KB Created: 2020-08-28 04:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 718c1b0b0b341cb1261bb8d1efde36a5 SHA-1: 9e60131a166da73fc1e39f1e2ce6b3f655bc4c21 SHA-256: e31c6b712924c88924132cdb9957ab95d8a376763c4b27a258412044d8108f57
120 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.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'human anatomy laboratory manual'. The PDF also contains a mass external PDF link farm, with many links hosted on Shopify, likely for SEO manipulation to increase visibility. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload.

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.com/pify?keyword=human+anatomy+laboratory+manual
    • http://files.wiccloutreach.info/uploads/1/3/0/7/130776619/1760454.pdf
    • http://files.michellexiao.net/uploads/1/3/2/6/132683070/rozivi_nixuwudafini_kujanide.pdf
    • http://files.stresscafe.com.au/uploads/1/3/0/7/130740551/fuwulowixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0314/0517/files/papugubefefup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/xulotufizanukuno.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/aditya_birla_capital_annual_report_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0438/5354/5632/files/rogavam.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/kimiwugimajobirelelal.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/4646748451.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/86871358657.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5538/files/pet_animals_hd_images.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/58406102447.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/tiwuwuzipiwuzajimerufoxi.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_off000053e6.bin
2ad7b7b3620eafbcd0c4165690d0f07af480c995aefc63cb99d3f7fd3469eef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E6 4572 bytes
font_01_sfnt_off00006343.bin
92d082867d28e211705bf2b728e1cbccbbaf0fd055fc50b5056dd5b1b40a3b5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 10184 bytes
font_02_sfnt_off0000863d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863D 4324 bytes

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