Malicious PDF — malware analysis report

Static analysis result for SHA-256 78836b74087339d6…

MALICIOUS

PDF

37.7 KB Created: 2020-08-17 00:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22066ee8f74c1b565d99710a9079c3df SHA-1: 515b6ab3b88223454535fb68225acbd38566f3d1 SHA-256: 78836b74087339d6c27449599351350f6e63674462ffb19b503beb63f877a3cf
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content, likely intended to trick users into clicking through to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of a redirector link supports a phishing or malware distribution attack pattern.

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.com/pify?keyword=letter+v+worksheets+for+toddlers
    • http://files.klynnewagner.com/uploads/1/3/0/7/130775653/zujemekoseviref.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/vedujumebutimule.pdf
    • https://cdn.shopify.com/s/files/1/0440/3026/3446/files/27364333712.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/holt_california_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/2728210736.pdf
    • https://cdn.shopify.com/s/files/1/0439/5650/2686/files/credit_union_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6024/files/dowune.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/39434641173.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/26983498124.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/29513669783.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/rafoduzisame.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/60566414075.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4229/files/duxijemupevorazoxajadin.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_off000057b3.bin
431d54143b7db28e27370f81095094fa4d76dbe4fa26676172d26d5e23237265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B3 4940 bytes
font_01_sfnt_off00006892.bin
fa2cdb198ced7bc5f72f5a758b163aacbc2ced566ecd5fc5df778210282449d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 9876 bytes

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