Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc7bdcd297ef843…

MALICIOUS

PDF

48.4 KB Created: 2020-08-08 01:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f9401e39bd16d30e13eb05700384fbd SHA-1: 2414eba7456234d90daa5050376d184dcdc9b67a SHA-256: 5fc7bdcd297ef84396bca860c9355ba5c402197f06b06a302f8ba01436f7e326
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known to host malicious content. The document body itself contains obfuscated text and URLs, suggesting an attempt to lure users into clicking these links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=bloodleaf+crystal+smith+pdf
    • http://files.latitudetravelplanning.com/uploads/1/3/1/3/131383456/8600167.pdf
    • http://bigumof.kamiza.com/uploads/1/3/2/7/132710621/pesafop.pdf
    • http://files.surf-school-capbreton.com/uploads/1/3/1/4/131454766/sitegabunul.pdf
    • http://files.balshamreview.com/uploads/1/3/1/4/131438308/sixumisavir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/14702556261.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/10881203484.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/gamegezasasedenofug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/disable_macafee_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5084/files/bamuvepenewebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/37846686843.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/56737909097.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/85237613610.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/21338555934.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/delegation_in_nursing_management.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/stock_market_basics_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/tisitetemobuzuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/vuredexuxujaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/87919260388.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_off00008065.bin
67c531be47e278fb6bf8f7541754c42f9bb804ebf429501865b8a0a777ddddf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8065 5544 bytes
font_01_sfnt_off00009326.bin
9d6b552333afaa116261badd5050806a30c7aaa6dee2be38a5a3b84a3f67d827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9326 9760 bytes

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