Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5772f5c3636e06…

MALICIOUS

PDF

39.4 KB Created: 2020-07-29 04:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36cb5e26599ee2e48746bdc2b4fbca6f SHA-1: 90e8e0003d795d46a36f8bb93591753e6733c3cc SHA-256: 0c5772f5c3636e064a933100029bcd558d5783fee84f7db715ba4c35d8717232
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 redirector service known to host malicious content. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure, and the ML classifier strongly supports a malicious verdict. The document body, though heavily obfuscated, contains references to 'episodes free' and 'wkhtmltopdf', suggesting a lure for potentially pirated content that leads to malicious sites.

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.com/pify?keyword=cid+episodes++free
    • http://files.taverhamdaycentre.org.uk/uploads/1/3/1/4/131408913/6a5f1.pdf
    • http://files.judicheco.com/uploads/1/3/1/6/131607712/9605056.pdf
    • http://files.zioncitycogic.org/uploads/1/3/1/3/131380397/dafamazonil.pdf
    • http://files.twistedrootswood.com/uploads/1/3/2/6/132681337/zumagitilapo-zogodizove.pdf
    • http://files.twigflowers.online/uploads/1/3/2/3/132302711/rivekexutun-wigifetugu-mamuzaxigokif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6592/3997/files/xasazete.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/3640430697.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/buberibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6006/files/zelabaro.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/xevemizikoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/1958547555.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/65829387473.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/pixejuzewojitixora.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/legojudegupavure.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/zojusemuzezujoseje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/80113190781.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_off0000603a.bin
78548fe327d2cea9ea889156549220efad4ac10a5bbd05aadae2305c839f0486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 4416 bytes
font_01_sfnt_off00006f45.bin
0a1e9394f2ef406ba911081b12501c55da4c97c413549edfcbc8f121f5505132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F45 9816 bytes

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