Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eed2a0ccf5dc26…

MALICIOUS

PDF

53.7 KB Created: 2020-08-10 14:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa81863a9bee2a537fb463ae61257e1c SHA-1: 601882949c73dd0782716d71263ce486784123d9 SHA-256: f5eed2a0ccf5dc26e0e49c2caf40adabbb2af345a4e4d40b83faf6263cff1113
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to a magazine download, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure via a link farm.

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=bsc+magazine+september+2020+pdf+download+in+english
    • http://files.mcmillansofmalton.co.uk/uploads/1/3/1/4/131407952/bb2479e52a43f2.pdf
    • http://files.crossfitharborsprings.com/uploads/1/3/0/7/130775347/f13be5597e.pdf
    • http://warur.800steps.com/uploads/1/3/1/4/131482975/tudiwuserafemapazexu.pdf
    • http://peferujaw.oksirconnect.com/uploads/1/3/1/6/131637881/sabojexajakizune.pdf
    • http://files.focusonthegood.com/uploads/1/3/1/6/131637606/zaruvipopogodim.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/minecraft_grand_theft_auto_mod.pdf
    • https://cdn.shopify.com/s/files/1/0429/1998/5319/files/pipukuparuba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/pakuta.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/levilodilixozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/dr._arnold_ehret.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/76070092951.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/wovigulebevegukuwigoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/luderimozemopuvon.pdf
    • https://cdn.shopify.com/s/files/1/0440/5769/0262/files/15084263106.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/fulunetebewuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/sepewixerekutofopapepulup.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/2176685651.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0711/files/the_coldest_winter_ever_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/94585492687.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/
    • https://cdn.shopify.com/s/files/1/0429/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bf7.bin
5b7fdefc475dc799f317b5c533a61263770dd582ed56916e27d1706bb7d1a1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF7 6176 bytes
font_01_sfnt_off0000a0d3.bin
74d214dba2250dccbcfa0166dcdf31454bff46d8a5c89885ac4277078c680295
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D3 11224 bytes