Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e95de8b71a30a3…

MALICIOUS

PDF

87.2 KB Created: 2020-08-08 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1311bf0f16de9c41bbbde0b5f71ede SHA-1: fb3c5db732e846ff0ed16ba3e597d062287a02e1 SHA-256: 90e95de8b71a30a35a145cf39118ddafdcc904d80aaf89ce84088d3bd611404d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the string 'ncert biology pdf download' and the malicious URL, suggesting a lure for users seeking educational materials. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely to further obfuscate the malicious intent and distribute the payload. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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=ncert+biology+pdf+download
    • http://files.enjoyinglifeontheroad.com/uploads/1/3/1/4/131453256/a6c6c8194ff59.pdf
    • http://warutewi.whatsthegfc.com/uploads/1/3/0/8/130873995/rubutukupimu-wujidum-leruzositove.pdf
    • http://sedixo.thecommunityautismnetwork.com/uploads/1/3/0/7/130776208/rovizanudur.pdf
    • http://files.planetaindigena.com/uploads/1/3/1/3/131380343/1532088.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/73218140967.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/53849942601.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/51092837663.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/85024684590.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/93491442843.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/how_to_hack_cursors._io.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/24911442814.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/fogedatamepolekifuxamug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/pokemon_fire_red_codebreaker.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/zukaleletu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6241/files/lejumatibivazozegaz.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_off00010cea.bin
8cadafeb957145357cdcadceab5b8fa2c344fe281aa6106c7de79336d63650eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 5448 bytes
font_01_sfnt_off00011fa1.bin
454edbc03276d9152b2cd1c02acd9d893fcc779ae068fbc116e3d2a7f698326c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 15420 bytes

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