Malicious PDF — malware analysis report

Static analysis result for SHA-256 824cde8b58c714ae…

MALICIOUS

PDF

42.4 KB Created: 2020-11-03 07:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a84723c0a586e2151b58af6ef242b470 SHA-1: 1c31888075c2b44028f4c8af5fb2afcfa6ed68a0 SHA-256: 824cde8b58c714aec87ab51828059cde31007a3ee632ad370a562cc4ba511ce5
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading potentially harmful 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.
  • 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://cctraff.ru/123?keyword=downloads+app+pc
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f9fa3408e647.pdf
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f8f9ad2a1664.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f8f615fe4222.pdf
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fa0cc280bad7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/roware/59933175332.pdf
    • https://uploads.strikinglycdn.com/files/e28c82b4-d56e-4d2f-ae2f-e1e9ebe99f2e/harvest_moon_island_of_happiness_guide.pdf
    • https://cdn.shopify.com/s/files/1/0478/2627/2415/files/jafugo.pdf
    • https://s3.amazonaws.com/luropi/vampire_the_masquerade_bloodlines_console_commands_money.pdf
    • https://cdn.shopify.com/s/files/1/0268/8463/6859/files/murezovoduriledozove.pdf
    • https://cdn.shopify.com/s/files/1/0480/1108/3935/files/63333755663.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/pptx_viewer_for_android.pdf
    • https://s3.amazonaws.com/sojaxub/tax_working_sheet_2020-21.pdf
    • https://s3.amazonaws.com/susopuzupure/23887434297.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_off00005c81.bin
ec056d8604a32d7b406eb8dda13208715284eabb41ac8f3a6d85c671bfe8480f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 4604 bytes
font_01_sfnt_off00006c3c.bin
ffdcd1a75fce2f68e3f11b3624913a5f210747d0f56b05fae494b5c51c3dd36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3C 10172 bytes
font_02_sfnt_off00008f19.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F19 4324 bytes

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