Malicious PDF — malware analysis report

Static analysis result for SHA-256 77428b3f4654c663…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 20:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 679b6cab6cbb6bf7c6247ed2aa44626a SHA-1: 0792f3a574c91510a0cd3ac69d5b38176ada1ac3 SHA-256: 77428b3f4654c663a2293267c6cbd10872128c54fc20e0a1ac6a36d17daf0d14
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'curriculum guide'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=shs+curriculum+guide+organization+and+management
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/7041e4_56f9687c2660470eb25a270901a2f453.pdf
    • https://static.usrfiles.com/ugd/10a4aa_261e1f28deaf4fd8a81a4d52edcc9e60.pdf
    • https://static.usrfiles.com/ugd/696b8a_f1fb1b106c0f4a34a4c13d0b9a51175b.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b9d9deb186495c844334894d34d319.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/77078297050.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/tatalaksana_angina_pectoris.pdf
    • https://static.usrfiles.com/ugd/ba3095_a1c3b3202e75434cb01036808fa4412a.pdf
    • https://static.usrfiles.com/ugd/c068f8_bdff18d75f004349836316ca038f0772.pdf
    • https://static.usrfiles.com/ugd/fa6f14_ffc99d3b2c9b4dad8ac27a3adf60e5b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca5af8255dab4f77b418bf4e95e8d011.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/menine.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/cardiac_output_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c7.bin
013b5e9aa78044d29a2f24fd3170df90bc587770dd8bc7ca5126833f87fc97c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 5388 bytes
font_01_sfnt_off000075e8.bin
74db11cca831858a9961d34f286feeae736ea5700b41577fa080a28868cd6368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E8 14756 bytes
font_02_sfnt_off0000a3ad.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AD 4324 bytes

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