Malicious PDF — malware analysis report

Static analysis result for SHA-256 f262c01be62f503a…

MALICIOUS

PDF

104.4 KB Created: 2020-08-03 13:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8669e775a0ab12dbd18cfe2b62affc SHA-1: 78faa245b76eff2ffae9bfffd7b0ac90b4c37170 SHA-256: f262c01be62f503a5f30ca76f17704dc1703c19482f9e45ce8237c4503a692eb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains text related to 'Comunismo e socialismo em pdf' and the wkhtmltopdf tool, suggesting a deceptive lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the final malicious destination.

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.com/pify?keyword=comunismo+e+socialismo+em+pdf
    • http://files.labradorpuppyforsale.com/uploads/1/3/0/8/130813132/simitepikuta.pdf
    • http://files.pachamamanativeart.com/uploads/1/3/1/4/131483254/8172b609879.pdf
    • http://files.lauradunnart.com/uploads/1/3/0/7/130739731/1012493.pdf
    • http://files.ameafterdark.com/uploads/1/3/1/4/131483391/6013168.pdf
    • http://files.triathletewithin.com/uploads/1/3/1/3/131378838/bb794e7dee4864d.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/dojeribivotofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/25229579507.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/kigomukir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46552055365.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/5090203348.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8476/5591/files/bizewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/zaluvirebalesot.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/79742803501.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/webomobituwisumepepaxifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/combining_files_on_mac.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_off000156d4.bin
733578206dd31f6bc011eb9f655dc86ff0b88d73992b72f43e81522add44a389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156D4 5108 bytes
font_01_sfnt_off00016822.bin
7ab08e8731d572dbd453a5ccae783e267ecef263a9b34dde972fcf7e12490e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16822 15184 bytes

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