Malicious PDF — malware analysis report

Static analysis result for SHA-256 b640e9f773e6dd46…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 21:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b03a4d179619e361929de210e1a10bdb SHA-1: 965fe6f2a7b3f7e729c2045c2284bd6d851b32f2 SHA-256: b640e9f773e6dd46425d40c5f9a22a2466feaccc9b4f454c5143e35a134990bd
150 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector at `ttraff.ru`, which is likely the primary malicious payload delivery mechanism. The document body and embedded links suggest a lure related to study guides, aiming to trick users into clicking through to malicious sites.

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.ru/pify?keyword=asvab+arithmetic+reasoning+study+guide+pdf
    • http://files.agoodsoakbathandbody.com/uploads/1/3/1/1/131163960/fipudewezes-gawegadukuga-zosopinenikomu.pdf
    • http://files.revfrankmcfadden.com/uploads/1/3/0/7/130738792/6004182.pdf
    • http://files.darnisart.com/uploads/1/3/1/8/131856815/gakusudaxuwapomevufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/zajisimutevanajaloxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5445/files/tinkers_construct_writable.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1575/files/raferabolinodulezomud.pdf
    • https://cdn.shopify.com/s/files/1/0437/9056/5537/files/statistics_for_business_economics_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/add_bookmarks_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/dufesalepalarupimij.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/renipafutixanolefara.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/49578294664.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/gafuvinidalasapu.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_off00005e4b.bin
07ba07ca06a998c0a45bac961999718d33112cb1b9c7f3c41bd17dca360736e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 5712 bytes
font_01_sfnt_off0000718f.bin
9e01dedd706235a8021babc7e447fa99b375e2e809fe95e1290498b887e9d9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 9992 bytes
font_02_sfnt_off000093be.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93BE 4324 bytes

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