Malicious PDF — malware analysis report

Static analysis result for SHA-256 574ece8cb013ecd5…

MALICIOUS

PDF

49.7 KB Created: 2020-07-27 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a183fbe86ae55f18511e6d0e8f7fcc SHA-1: 4ea4a9aee1d54ed3af99d4ef3b1efbefd60557cb SHA-256: 574ece8cb013ecd57bffd1c4ca32a7b19d95aa0dfb7a15c9d6c68a07da9dfe58
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to 'audio editing software for android phones'. The presence of numerous external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning technique to improve search engine visibility for malicious content.

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=best+audio+editing+software+for+android+phones
    • http://files.seattosleep.co.uk/uploads/1/3/2/6/132695418/1b7af.pdf
    • http://files.orangevalleycreations.com/uploads/1/3/1/3/131383510/bujofaketuwomidabej.pdf
    • http://files.therustywagon.org/uploads/1/3/0/7/130775286/6292be26be216.pdf
    • http://files.rivendellcoins.com/uploads/1/3/1/4/131454670/d5d868f.pdf
    • http://files.anchorchainkennel.com/uploads/1/3/2/7/132711999/dutabafirajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/tosudofewakonototakixum.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1075/files/buginivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/pivaragopuwadobovij.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/xenokad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/35078063488.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/tovowoginafujorigobuboz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/34080978303.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/xigazolugujomalusavefeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/64489019610.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/pedivalavus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jujirufevob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/wasowagujus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/69593989908.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/62084374664.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/77537935673.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_off0000832c.bin
ec1f9a8d59982a442c574316dde03a122dd99ec462baaddb502fed35d214eb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 5296 bytes
font_01_sfnt_off00009538.bin
fb660f4862b0e753e1f8c8103d559b8f16b424686908c4df84f923394fa0162f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9538 10636 bytes

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