Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df36bc9f4ede07b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-03 11:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bdf8e1603d859e7b0d44264aeb7275 SHA-1: 3c9570c472c5337882ba4d9a2d822a3b2e854a85 SHA-256: 8df36bc9f4ede07bb9761f1b732556024c5dc3859bd017ab69223dff8b9d8af8
152 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded URLs, with one specifically identified as a known malicious redirector. The document body appears to be largely obfuscated or contains minimal readable text, but the presence of numerous links suggests a link farm or redirection tactic. The primary attack pattern involves leveraging these links to direct users to potentially harmful content.

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=ametropias+oftalmologia+pdf
    • http://files.bestofvictoriabc.com/uploads/1/3/0/9/130969811/zuloze.pdf
    • http://files.maxinewade.com/uploads/1/3/1/4/131483027/fufetokepavige_pokif_dupezizuza_dusufo.pdf
    • http://files.transformationsbyerin.com/uploads/1/3/1/4/131453248/309337.pdf
    • http://files.lightingupbrixham.com/uploads/1/3/1/4/131452903/janilikijikedefewe.pdf
    • http://files.leveluponline.com/uploads/1/3/1/4/131407493/galejedizefik_xutavekila_kesuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/42734460150.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/60524390289.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/74431389743.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/pip_command_not_found_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/16480005711.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/7859681907.pdf
    • https://cdn.shopify.com/s/files/1/0436/4461/6864/files/48536129816.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/matem.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/sentinel_exploit_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/20545451271.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/tutomevabigexarujojixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/37011970477.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/70254678026.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_off000066cd.bin
bb8e7efc4fbccc3c126c6e18f47a3947b772f250209d04b6717fe471d35e4358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5348 bytes
font_01_sfnt_off000078e6.bin
a38b68620557536ed852c25b06af2c8207bb1c5a4c23555e56cf008d08208e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E6 10296 bytes

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