Malicious PDF — malware analysis report

Static analysis result for SHA-256 4533fd8cce6271f5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 18:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e25e1c8e4048918462ed5aa1e200e5af SHA-1: 3c3239db99e573d9cf9167e9d12cb1f832b0eeb3 SHA-256: 4533fd8cce6271f523c7e22caedae20a4ea49afda1af83e9271a28f7ca1fbd2a
154 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.ru, which is likely used to funnel victims to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a study guide. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly supports the malicious nature of this PDF.

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=guia+ceneval+exani+ii+pdf
    • http://files.oceanstrings.net/uploads/1/3/0/8/130874620/7466807.pdf
    • http://files.carpiserve.net/uploads/1/3/0/7/130776490/f52edfc5b475dac.pdf
    • http://files.montclairathletics.net/uploads/1/3/0/8/130813588/nexaxewezo.pdf
    • http://files.chemistrywithdrjames.com/uploads/1/3/1/4/131407247/pozejageraxamivugete.pdf
    • http://wixixane.theirrigationrepairspecialist.com/uploads/1/3/1/4/131437363/ninagerobatapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/gaguxidodelurobaluf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/43222986019.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/39636202744.pdf
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/murujirufodupiwolojude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/35344662152.pdf
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/flac_to_alac.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/pokemon_sprites_gif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/vinizefawelexutuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7671/files/computer_network_topology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005252.bin
5abd46be5173b38611e1da0f61b5939d6b16590cd986cee61763b1b749c72895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5252 5036 bytes
font_01_sfnt_off0000639d.bin
ed6ab837a74fa2d96675603ba8dc707fbae20959ba95fac2dcee6c0d9125d7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639D 10064 bytes
font_02_sfnt_off0000861c.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861C 16312 bytes

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