Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d6aa9910ed25f3…

MALICIOUS

PDF

40.4 KB Created: 2020-08-05 17:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8947bceb6f88bcab77c0e5a14558c2b2 SHA-1: fb6982b074fa712ec9ab123c083b919cb5bedcfe SHA-256: 09d6aa9910ed25f377ae39cbb563e30a5c9b8ca4dee61ae01b9ae5a6cb6058d3
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a seemingly relevant keyword. The document also contains a large number of links to external PDFs hosted on various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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=bible+theology+books+pdf+in+tamil
    • http://files.daniellerobidoux.com/uploads/1/3/0/7/130740444/fudevodawotudujen.pdf
    • http://files.ps38rclc.org/uploads/1/3/0/8/130814346/3639177.pdf
    • http://files.prismcounselingservices.com/uploads/1/3/1/4/131438128/wedavimulidix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/mikafewow.pdf
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/gidifiremawipugom.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/rokeziwupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/50279591717.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0944/files/gogufeneliwemiweko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/wumalem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/xowopanivesebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/xumebalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/the_elder_scrolls_iii_bloodmoon.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/introduction_to_statistical_machine_learning_with_applications_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/daxen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/86699805993.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/litupowufanikibunula.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/50706564134.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_off00005e1a.bin
b08fa87ceee9ebbc9eb95d28ed001f0b84b3a3c318a87fff775084ed55f1ad01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1A 5716 bytes
font_01_sfnt_off00007176.bin
cbcc969f24a63807e3e131b9810da61eec7c2f47dc4c1494500cb8618488f709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7176 10316 bytes

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