Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c87a5cd21694f5a…

MALICIOUS

PDF

34.1 KB Created: 2020-08-03 22:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5518fc357c7a11164a747d3c018cdbf SHA-1: 74aa1835bab42a45e92b334e954470f65c1bc60c SHA-256: 1c87a5cd21694f5a5aef833acbe8e54bc18b175cd5ae26b83d13365f9d3c5252
152 Risk Score

Malware Insights

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

This PDF document contains a mass of external links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.cc/pify?keyword=rig+veda+in+bangla+pdf, which is known to lead to malicious sites. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm designed to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=rig+veda+in+bangla+pdf
    • http://files.tjoneseducator.com/uploads/1/3/1/6/131606890/8713539.pdf
    • http://files.joshuajberryhealingarts.com/uploads/1/3/0/8/130814106/1484107.pdf
    • http://files.uintahonline.com/uploads/1/3/1/4/131454172/pinoruj-wumeviwi-zabelodarut-tujavojitak.pdf
    • http://files.boshuster.com/uploads/1/3/0/8/130813988/relaguxo.pdf
    • http://files.uhbauerwomensociety.com/uploads/1/3/1/4/131409463/8935704.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/55614742310.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/49774781463.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/nosisubenobixoxomafaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/29193324384.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6314/files/57904676773.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/59664294498.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/65827853662.pdf
    • https://cdn.shopify.com/s/files/1/0435/4631/2863/files/sedexadosizujazuperemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56655156305.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8482/files/kukimuvaragudipuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/32180583814.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/83152375991.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_off00004711.bin
7029b8d5ae26f41e22c54d0b4693c20bb49f76c812137cb0b7fa6ee257a12b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4711 5144 bytes
font_01_sfnt_off000058b6.bin
6e1ed1c33e4aaef499cbbeab48742b06f838e786a2803b5cd58f51afb54421c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B6 10328 bytes

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