Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dc8c48483f470a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-05 17:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1dba3987efce80d018d94f92d38d246 SHA-1: 7f6b46a1f73d4bf7137b493b3c3179c49714ee75 SHA-256: 36dc8c48483f470a5a6e89e533d83c4e7c6d0d1e02d74d0fa210886884a5e858
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of SEO-optimized PDF links, indicating a link farm designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, but the extensive malicious linking is sufficient evidence.

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=meteorological+instruments+pdf
    • http://lawanol.urismilansky.com/uploads/1/3/0/8/130874232/4365027.pdf
    • http://kerazowu.jillwilliamsfineart.com/uploads/1/3/0/8/130814168/2767350.pdf
    • http://files.geomaticsworkshops.com/uploads/1/3/2/6/132682471/6877862.pdf
    • http://files.leafoutak.com/uploads/1/3/0/8/130874244/69d3001ca5bf155.pdf
    • http://files.natakcompany.org/uploads/1/3/0/8/130874380/wofana-konoverozafod-vizekenowikuxo-mixaraxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/sosisisiwobiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/wemogizepabifafena.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/564221376.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/kizimevamelakaseginosax.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/femowadiwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/sufetaruguloba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/arkham_knight_pc_updates.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/mad_world_gears_of_war.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/linutibemimajutobepugi.pdf
    • https://cdn.shopify.com/s/files/1/0447/4201/7173/files/etiology_of_traumatic_brain_injury.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/67113007375.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/51180526860.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/baliwor.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_off000078f7.bin
5fab53ea45c13363e1bb52b8dfb43eefc2bf1d8ce038e041a23c7cfb612b0bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F7 5480 bytes
font_01_sfnt_off00008b93.bin
ede52cec91c50652711c5e47a7316a04fb150f5d89280a6191db439ba3243546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 10044 bytes

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