Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6204c1b5ebd0f7…

MALICIOUS

PDF

43.5 KB Created: 2020-08-21 07:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 762d28b7f0625468bbf7ba66746565ab SHA-1: 2143e3385d34a3bbb234872903420ddf15ed0530 SHA-256: dc6204c1b5ebd0f778ad6e944baf17d1e3b136e011d83a91fe2b9e268deeaabf
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=system+of+equations+elimination+method+worksheet'. This URL is presented within the document body, suggesting an attempt to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The document body itself is heavily obfuscated but contains the malicious URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically.

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.ru/pify?keyword=system+of+equations+elimination+method+worksheet
    • http://files.devinhuntillustration.com/uploads/1/3/1/4/131452977/7212833.pdf
    • http://jekutiz.matcha-ya.com/uploads/1/3/0/8/130814328/8836058.pdf
    • http://nagexog.areyouinpartnership.com/uploads/1/3/1/1/131164250/jovigak.pdf
    • http://files.permajackofmidmo.com/uploads/1/3/1/4/131453522/719331.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/clement_of_alexandria_paedagogus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/bulletproof_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/nvidia_update_core_failed.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/28545503837.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/gosivuxudepobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/97902633953.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/english_speaking_learning_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/base64_to_file_converter.pdf
    • https://cdn.shopify.com/s/files/1/0443/8661/5462/files/animated_icon_pack_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/44616460407.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/detagexesamobegevas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/23365866998.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/49920469970.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_off000055d8.bin
312364ddf5a8858171dc5dcd2825f86ec5ad871f9d96f8df7b3f0e20a1229e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D8 5636 bytes
font_01_sfnt_off000068e4.bin
1a4ac827d507ff436407dc40e6c855ed6df9c426eba1c8b8d6738f22be0cf375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E4 10088 bytes
font_02_sfnt_off00008b9b.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9B 16060 bytes

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