Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9de52b1c7ee6d9…

MALICIOUS

PDF

39.9 KB Created: 2020-08-02 23:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80d07c9cfda4a7ea06c1fa04def453d7 SHA-1: 2730b9ef111e9973ece9ce908ca0ddd5ae10c717 SHA-256: 5d9de52b1c7ee6d99503c893547039a46442772f737766fbf1e09578e70dd40e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a Windows 10 activation prompt, aiming to trick users into clicking it. The SE_CLICKFIX heuristic indicates the document likely instructs users to execute commands, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=non+core+edition+windows+10+activation
    • http://files.davidabrehart.co.uk/uploads/1/3/1/3/131381677/gadarolamub_bimuwuku_godibomuxawav_boxajovenezokon.pdf
    • http://files.bolbi-edu.org/uploads/1/3/2/6/132681882/nirijiwawijikawali.pdf
    • http://files.khatibenergy.com/uploads/1/3/2/6/132682076/lavinizi-kokekuwe-jusagusaxaperu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/77910259220.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/61050765163.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/29267265310.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/20809695911.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/37164974419.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/zamezikanepudosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/2434849222.pdf
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/puroladevivegirufilimesaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/7411291117.pdf
    • https://cdn.shopify.com/s/files/1/0438/6937/2576/files/44638413218.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_off00005e48.bin
9c6adba220daac13a46143aa6c51b924e973207248f39d7b1243473a0ca1a14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E48 5216 bytes
font_01_sfnt_off00007038.bin
71f8fac72294efe1a451881bc4b9e580e84ff6cae34bc673d54137ca3c0f27af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 10060 bytes

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