Malicious PDF — malware analysis report

Static analysis result for SHA-256 7301394576ee0460…

MALICIOUS

PDF

113.3 KB Created: 2020-08-10 03:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91b97347f9abe5df985c24c83e6058f3 SHA-1: e7353bc6be0edcd32623f2067c7bf4328fbef622 SHA-256: 7301394576ee0460911868a67bb5cd3a753db744bccbf319fb285714412cd2ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical link identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a harmful site. The presence of many external links points to a link farm strategy.

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=icao+annex+14+volume+2+7th+edition+pdf
    • http://files.qcdorganics.com/uploads/1/3/1/3/131398143/keguna.pdf
    • http://files.thebestinmusic.com/uploads/1/3/1/3/131380295/topanusajagomo-wawudajuka-fekelovele.pdf
    • http://files.davidreeb.net/uploads/1/3/1/8/131871871/vuxozupawazim.pdf
    • http://files.cayf.org/uploads/1/3/0/7/130738644/vuradis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/xisibiteruduwazur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/fivaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32505595602.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/90495536243.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/relative_clause_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/gaxefeputuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/neuronal_ceroid_lipofuscinosis_review.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajakeveposemilakojataza.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/vudapilizirolurus.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a94.bin
99bb13d7d646e2ab88d8525f586970d04fbecf2f639b06ed812917dbd56b635c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A94 5540 bytes
font_01_sfnt_off00017d69.bin
3c71f8efd32a9ab715a3f328e2a165f35070da8e5e9bc11c90f073755234628e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D69 10880 bytes
font_02_sfnt_off0001a2b8.bin
275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B8 16112 bytes

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