Malicious PDF — malware analysis report

Static analysis result for SHA-256 1445955380519e3f…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 08:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95b30a60c3d3e7b0cebaf877e78e7dfe SHA-1: 0e3c1c235e68fb6a6d8e4097ed9500887562e3b0 SHA-256: 1445955380519e3fd8fdbdaff6b6bc43b3f832ac5996fdab2644a505d34915c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs that lead to a redirector service, which is a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains text suggesting it is disguised as instructions for a toy, likely to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness.

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.cc/wix?keyword=hexbug+battle+spider+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_614345f4df674ab5bdd4266c150813d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8649b4894614051aeb2fadee47746f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2663c615b807421097394a9926e602c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c6ca8ab3c047ce8bc65f36f4d9e784.pdf
    • https://static.usrfiles.com/ugd/b8c837_5156146dd94d42c391dd8b185ecb2520.pdf
    • https://cdn.shopify.com/s/files/1/0432/1420/9186/files/fefok.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/minecraft_psi_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/67421546924.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/jirinopo.pdf
    • https://static.usrfiles.com/ugd/b8c837_2864c0b8778c45d29c5d8a9033527cd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5682ad6c1e824fad9ebf8d3a9c35d490.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_off000058c0.bin
6b50830bf341b4dc98039fe5799aecb52fd817e16be9d7f8503793ee3205d2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C0 5412 bytes
font_01_sfnt_off00006b28.bin
1f3cc73bab8832eff43156efbb548f65f607d7b1eff9615e36773cda8d25fb95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B28 11148 bytes

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