Malicious PDF — malware analysis report

Static analysis result for SHA-256 8114ecd2fea04f56…

MALICIOUS

PDF

52.1 KB Created: 2020-08-12 10:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 597ad60fef78e11b7315f6bb7a79d56b SHA-1: ca4d675a1c82e791574f068df1f3e1abd443eea0 SHA-256: 8114ecd2fea04f56807d518b7f5e76686682bf69e55cfdfe583d81fd6e9483e7
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 external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure.

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=applied+linguistics+guy+cook+pdf
    • http://besid.systemath.com/uploads/1/3/1/4/131437987/mixebisitexovolerix.pdf
    • http://files.sunnydawngrooming.com/uploads/1/3/1/1/131164236/dumexeboli.pdf
    • http://files.staylorhedgesart.com/uploads/1/3/0/7/130739214/5aac84.pdf
    • http://files.threeravenspianostudio.com/uploads/1/3/1/4/131407493/zepegerifiporeluput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/catholic_holy_bible_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/46579901109.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/crush_the_castle_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/trastorno_esquizofrenia_paranoide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/95799041906.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/nuduvep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5363/7018/files/24556707104.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/24981702409.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/93790827690.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/18679695660.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/suvososuga.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_off00007811.bin
b5d7ec0e1a200b731999f4a9d3532e0996c412eb14511b7e7251103dfc43c2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 5172 bytes
font_01_sfnt_off000089d0.bin
64e7a020fe83efa06ca4f1deec029e296b137554011de6a3fc7d55d0eee80205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D0 10144 bytes
font_02_sfnt_off0000aca6.bin
f9711cef3ffb559c81ad9745ecc8fbef96de05f5d4c87c1b3b658693177715a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA6 16424 bytes

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