Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc82816b8ade65b…

MALICIOUS

PDF

51.0 KB Created: 2020-11-08 01:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d542b0924cd6b4eb1f5bf7acf5302fb SHA-1: bc89c7f29b73dc63a48cb55d784eeb6b13f3dcf0 SHA-256: 4bc82816b8ade65b6730cc02ff624db3c267f9de98e14ea82d06d7f530d7522b
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, ggtraff.ru. It also exhibits characteristics of a link farm, with numerous embedded URLs. The document body, though partially corrupted, contains the same malicious URL and a reference to a benign-looking PDF, suggesting a lure to a malicious site under the guise of providing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?keyword=ideas+for+bulletin+board+black+history+month In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f9958f8078f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b825ac91-92ca-4001-88a1-d4dab1b5849b/unforgiven_lauren_kate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d3e40a-48b2-4251-9e26-f92958a81bcb/woxozer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b724246b-0e82-47fb-80d2-59b867dac3e4/16328020705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfd4274-2db4-466a-b535-b6e29d97a716/71804510954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2434627f-87b4-4d71-b60b-6e6f54699ea2/lemefutipowivufiv.pdfIn PDF document text
    • https://bigumipadif.files.wordpress.com/2020/11/43471885132.pdfIn PDF document text
    • https://pemowusap.files.wordpress.com/2020/11/wurixekujikubar.pdfIn PDF document text
    • https://warolajil.files.wordpress.com/2020/11/le_pdicule_pulmonaire.pdfIn PDF document text
    • https://doxesudag.files.wordpress.com/2020/11/rubadelagokakibudunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf8225f-44fc-49f7-b187-ffbc4b6fc58b/88711439832.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54DE 5384 bytes
SHA-256: fe5b2e10badb2f697e3d2e75d21d835f05caa8f461136755ffa560443f48b209
font_01_sfnt_off000066f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 2144 bytes
SHA-256: 15c667cd5a285984e8e7fa28763aec0a4eb9a43f6b9e3b364b97494b8ef2ef0b
font_02_sfnt_off00007101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7101 13148 bytes
SHA-256: 28e558e3825fc2b5257c5bcd40b5b2283c32ebceb5fe4ec2614948df3f7e9af2
font_03_sfnt_off00009bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC9 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_04_sfnt_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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