Malicious PDF — malware analysis report

Static analysis result for SHA-256 873699a4f0dcb9f7…

MALICIOUS

PDF

36.7 KB Created: 2020-08-26 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f233e49d1ca34db16d573689fd7278cc SHA-1: 34ee42fe7d5074daaf4889482bcb4e61c474bf2b SHA-256: 873699a4f0dcb9f7070abba332e20e6663ef8811a97387ed5cf3178c84a96b35
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 links, suggesting an attempt to drive traffic to potentially harmful content. The presence of a 'download' button lure further supports this. Although no scripts were extracted, the ML classifier and redirector heuristics strongly indicate malicious intent, likely to lead users to download unwanted or malicious files.

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://ttraff.cc/pify?keyword=download+free+gospel+ringtones+andro
    • http://files.siobhannicolaou.com/uploads/1/3/0/7/130776148/1063716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/25770793485.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/bewamufodovuvoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1611/files/argumentation_inquiry_and_advocacy.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/75614713751.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/batman_arkham_knight_pc_highly_compressed.pdf
    • https://cdn.shopify.com/s/files/1/0434/8497/1173/files/arduino_based_mini_projects.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/95527925166.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/62236345707.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9082/files/bosuwunagobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/91818119347.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovegutug.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_off00005253.bin
1cfaae1d5df93628f82e500c5d516af462e937ffee476e1c7bcccde88cf9f32a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5253 5300 bytes
font_01_sfnt_off00006480.bin
41cff64d492d66384ab7e566db7bbfce8f0c16e0aa87583ab2711c183926f186
pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 9840 bytes