Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c55352ecbdc3cd3…

MALICIOUS

PDF

43.0 KB Created: 2020-08-24 10:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91e0ccd676dbc061c3aed37b8d9658b SHA-1: 208f1b454748f24475db3300684f1353d66171ed SHA-256: 4c55352ecbdc3cd35a07c9190691fd80eceb884377f029f62b2c0a3b5c93bb81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) or are part of a link farm hosted on Shopify. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting a deliberate attempt to direct users to malicious or suspicious web content. 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.ru/pify?keyword=introduction+in+reporting+in+classroom+example
    • http://pivotowad.nottinghamorthodox.org.uk/uploads/1/3/0/7/130775350/238234.pdf
    • http://files.mdgracedesigns.com/uploads/1/3/0/7/130775025/lufotol.pdf
    • http://files.leafoutak.com/uploads/1/3/0/7/130739648/rizofarovim.pdf
    • http://famikotul.kateloganbeauty.com/uploads/1/3/1/4/131438800/44d28d2c21d625.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/jomimiwikufag.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4847/files/95922468834.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/best_emulator_for_android_studio_amd_processor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/42828339585.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/19815614959.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/dubivuzajuxavujogimum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/sojefosaxamos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f5.bin
ab9e60ba26baf384faf3023f925b8cd475c61aaff73dcdd6766650c32a31ba8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F5 5400 bytes
font_01_sfnt_off00007c3b.bin
db7df058bd90d7859ef94cd4713a747cd58bab6105272ef54c4451e2f8fb60a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3B 10280 bytes