Malicious PDF — malware analysis report

Static analysis result for SHA-256 526d0a20a7edfc29…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69bbfe09ab008b1e2497edae80999d5 SHA-1: e6a4a31cac790f9eef8bc1cf0727042158a720c8 SHA-256: 526d0a20a7edfc291c651a245336fadc76ebda23cd45bbc7096e677309e5b97c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free dictionary download, which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body contains the malicious URL and other links that appear to be part of a link farm designed to improve search engine ranking 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.com/pify?keyword=bengali+to+english+dictionary+pdf+download+free
    • http://kogobufew.sosossportsscoop.com/uploads/1/3/0/7/130775045/runikavegukol-xugomarabut-fezogotutezo-tagokamaj.pdf
    • http://files.churchofgodbaptist.net/uploads/1/3/0/8/130873927/160500674a55.pdf
    • http://files.smarterbites.org/uploads/1/3/1/8/131856318/kewusel_meseduxalazokov.pdf
    • http://jamutefot.forkedontherhode.com/uploads/1/3/0/7/130775734/e3b78.pdf
    • http://files.laplumedebelinda.com/uploads/1/3/0/8/130874582/126939.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/gatiso_asma_ocupacional.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/xezitovusezirovamol.pdf
    • https://cdn.shopify.com/s/files/1/0448/3029/4177/files/serie_a_calendario_maro_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/homebrew_remove_package.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/seether_broken_lyrics_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/malazimoraroxit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/nujapaxamurutupaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/1663/1973/files/29842795957.pdf
    • https://cdn.shopify.com/s/files/1/0433/8185/0268/files/figunusugukup.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/98340058091.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/3373455996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.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_off0000647b.bin
57089c43586d89d8ca0afbd935cb4f4af75dcdbd4fbf00ae10af085bdc7f6a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5660 bytes
font_01_sfnt_off000077cb.bin
15fccb29cc67052ee67a9dd566e1f1a17be431a86bb042d999f98999aa8d092a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 10044 bytes

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