Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf68527203350fcc…

MALICIOUS

PDF

50.2 KB Created: 2020-07-23 20:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb34b8bd7426f61312c7b33ea372bb3e SHA-1: 828616121f00c57dd0e6ab497c36ef5830e5d8a4 SHA-256: bf68527203350fcc9bacdd75c51e0f8b34fc5d6b7f8f3ae516fd9173e720c540
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary link, 'https://ttraff.ru/pify?keyword=chef+cv+template+free', suggests a phishing or scam attempt by luring users with a seemingly legitimate search result. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=chef+cv+template+free
    • http://files.lustbikes.net/uploads/1/3/1/3/131378942/wekixinuxejotezep.pdf
    • http://files.textesoltwo.com/uploads/1/3/0/7/130739593/levodafos_rodokuk_fojuzinix.pdf
    • http://files.ironhawkelevator.com/uploads/1/3/1/3/131397946/1248871.pdf
    • http://files.shsu-xa.com/uploads/1/3/0/9/130969489/kadafe.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/77359145348.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/zutafopawed.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/94241492387.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4587/files/duzufalefedode.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/93057107561.pdf
    • https://cdn.shopify.com/s/files/1/0433/5275/2283/files/38938643458.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/31419550390.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/zozobefifitularutavif.pdf
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/79744877663.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/bufutifixove.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/vifokuwufijoxenenizozefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/vuxudovu.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_off0000891e.bin
b69f3164726ea3a85ca55818142095c50a7963b731a6fa3a5bb1e09fc6a430bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891E 4684 bytes
font_01_sfnt_off00009911.bin
4d3d69c2b237918d10a185fcbe04a607f496341d98f1448acb9a00e569c3fdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9911 9996 bytes

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