Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a7590e623d4b20…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742a0b7fd3fb7d7afdea49ff8946d523 SHA-1: d0c88b160ac09f0075d6487ea21bf1a0edf066ff SHA-256: 79a7590e623d4b20e0120bc39d731c1e88b4291b3560c78f6b6add7592b4bb9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. The primary malicious link identified is a redirector to a potentially harmful site. The document body, though heavily obfuscated, contains references to the malicious URL and other links, indicating an attempt to drive traffic to external resources.

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=analytical+methods+in+conduction+heat+transfer+pdf
    • http://muziva.inscience242.com/uploads/1/3/1/3/131398591/9535620.pdf
    • http://files.healthymamahappymama.com/uploads/1/3/1/4/131437862/wofiwesit.pdf
    • http://files.eurocastanea.org/uploads/1/3/0/7/130738841/jixefewime.pdf
    • http://files.dmrproductions.online/uploads/1/3/1/3/131378838/9628368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/77112151054.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/mamipoduwolemunififibo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/sekumam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/xogudowiritogemapetuvukaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9009/1940/files/ssx_tricky_ps2.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/brockport_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0555/files/nujiforevokexujukapetux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/95911883548.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/nosumaginirita.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/xotaravuw.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_off000047e7.bin
fbbaf8ce817c17330eca3419aed727d70e1105a89891e8fd2f7fa919ebcaed52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E7 5484 bytes
font_01_sfnt_off00005a63.bin
d10ffc768f3f5235d09d08b42d805e4cb2824310d76056214606e5af655071a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A63 10056 bytes
font_02_sfnt_off00007cd9.bin
682256c57b2fd9f882862317fc3df4850f92c7857459e60c69c41d69f8fbe734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 16488 bytes

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