Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b705ab9a8c80084…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 18:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8d014e54a4525b01a78e90047671d7 SHA-1: ecf84729f8ef82182ee649ca872e973f4cf92ca8 SHA-256: 4b705ab9a8c800844f43750504a6c55ed7fc0a544ad4f96eeb2b43523c4b04d9
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves to obfuscate the ultimate destination of the attack. Another heuristic indicates a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to leverage legitimate platforms for hosting malicious content. The document body, though heavily obfuscated, also contains the suspicious URL.

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=basel+1+2+3+norms+pdf
    • http://zupuf.danigosha.com/uploads/1/3/0/7/130738696/0f3cdcb35a7.pdf
    • http://files.lqblackpool.co.uk/uploads/1/3/1/6/131637178/f83cdf.pdf
    • http://files.naplesmarketresearch.com/uploads/1/3/1/0/131071067/vowexe.pdf
    • http://files.esoterichealing.com/uploads/1/3/2/3/132302907/2803841.pdf
    • http://jodixepa.therocdweller.org/uploads/1/3/2/8/132814930/1576639.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/6767894917.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/bowefozexugij.pdf
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/23531873834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/27266201336.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/74980911805.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/albertsons_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/80050329447.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/kopifujomuwejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/tajimibo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/cbre_appraisal_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/dazejofutazotixu.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_off00006e57.bin
8fc4730549a0a08a97f578a7260fb1f34b7a6932dfbf7a66d274dc57dce813e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E57 5584 bytes
font_01_sfnt_off0000813e.bin
9cefce6e83f3c017cc7eab806be23755c0471b20b4cec38c29fb8f0c1def7385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 10140 bytes

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