Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6272e9f7b6b027…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 19:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73eee41987f877273df25490dece8e14 SHA-1: c63fa3e1484a86ada9c7050b36e120a8a0ff0d4b SHA-256: 8f6272e9f7b6b027f5b7ed9cfd615dfeaf56f8c3f8c68dfb380adff0f1bb1bca
128 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.cc'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for free worksheets. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the malicious redirector. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+printable+life+skills+worksheets+special+education
    • http://buzate.royzimmerman.com/uploads/1/3/1/4/131455636/belalusudojilipofi.pdf
    • http://files.letsholidayinmalta.com/uploads/1/3/1/4/131407552/vimogudirovi_jilotuderulabov_lunixoluluxogek.pdf
    • http://fufof.churchesindeerpark.org/uploads/1/3/1/4/131438477/f4c435.pdf
    • http://linan.mondaymorningpositivity.com/uploads/1/3/1/0/131070487/riwolojudefoj-mifupoguw-terewesafil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0124/files/80494057375.pdf
    • https://cdn.shopify.com/s/files/1/0434/6714/5366/files/zafomoloxekobarev.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/73386406494.pdf
    • https://cdn.shopify.com/s/files/1/0443/1160/9500/files/boyfriend_to_death_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/arteri_perifer.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4149/files/17217507826.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/bluetooth_software_for_pc_setup.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/66748743846.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/arduino_math_h.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/zojel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/lomulafexosuxiwaxo.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_off00005da3.bin
23051168b760990b05357f1ddd2afb7b4eaac86ee1bf699519ab3fdae33f2412
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA3 5496 bytes
font_01_sfnt_off00007052.bin
c3ac7be61c2e9928ed06afa6af48ece02afbadad68e376d1d6b621cd67b835fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7052 11604 bytes