Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b56c165717e1f5…

MALICIOUS

PDF

34.9 KB Created: 2020-08-16 23:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1a3d04ceb6070992a3dfe35a1a4911 SHA-1: ad8b00499d107cb25cf1d31b618b1291f5242545 SHA-256: f4b56c165717e1f551faeee71eb735883709c8455ec7fefa1067434345e937c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as a user manual. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering through a deceptive document, leading users to malicious infrastructure.

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=beko+double+oven+user+manual
    • http://gotix.mogosoapemporium.com/uploads/1/3/1/6/131607062/10845114cdebca.pdf
    • http://files.progrehab.com/uploads/1/3/0/8/130814926/xasim_galubevixased_mejujalat.pdf
    • http://files.ez-caregiver.com/uploads/1/3/1/3/131383318/wugoso.pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/25927728338.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/17911516438.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2240/files/kofudekojolis.pdf
    • https://cdn.shopify.com/s/files/1/0440/7227/2037/files/sunlight_javelin_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/52143971725.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/john_watson_behaviorismo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/acetaminophen_davis_drug_card.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/vaxuxelofi.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_off00004b29.bin
1b058071100e3f5a5f65d12d6a5adae0ee7a71478e94f8d745ce0f86686d914a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B29 5284 bytes
font_01_sfnt_off00005d0b.bin
33f45f9c5c43c31ae70114c7fd857ea854da21d2c44160aea3a24b19bbcf1d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0B 9936 bytes

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