Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c717756375ac845…

MALICIOUS

PDF

48.5 KB Created: 2020-08-03 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a307da9517729b6b3c9ae57804f2deb4 SHA-1: 730d0a9b8dcf188e1db9191b57b27eec3792fd70 SHA-256: 0c717756375ac84502e6d438d2c0e071376b2b6d45d877bf902faa0e6b2bad63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text and embedded links suggest a lure for downloading a PDF, which is a common tactic for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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=descent+into+avernus+pdf+download+free
    • http://files.serendipitygarden.ca/uploads/1/3/1/8/131856987/nunajitutise_zezen_sonokezer.pdf
    • http://files.jorgegomezelizondo.com/uploads/1/3/0/7/130775998/3043981.pdf
    • http://files.fifthandfederal.com/uploads/1/3/1/0/131070872/xawitejivolumamilawu.pdf
    • http://files.strathyhallhoa.org/uploads/1/3/1/3/131380440/8826950.pdf
    • http://files.myhealthandwellnessmatters.net/uploads/1/3/0/8/130874180/pelaxelakeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/85319349649.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/33987600518.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1296/files/pijomalesuve.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/gudutifelome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/63801389475.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/under_taker_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/liguvoxutetinamejirerozeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/63059839502.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/fopizutexigatifelitejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/56300750914.pdf
    • https://cdn.shopify.com/s/files/1/0430/6878/4791/files/14257885608.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f89.bin
ce0f648a747f4a0f490b564c227692d36303b176007272679e7df612cf1e9d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F89 5300 bytes
font_01_sfnt_off000091c2.bin
74ff66567dc17e7781151549ab5e59aa6299d7d352746ffc06da1dbd82eece50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C2 10376 bytes

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