Malicious PDF — malware analysis report

Static analysis result for SHA-256 de857d7fea6dfa3b…

MALICIOUS

PDF

49.7 KB Created: 2020-08-10 04:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf9a090c5ab182a415099cc9e8cd101 SHA-1: 2fecd76d2c81ddba6413f3b98590e013ebe782a6 SHA-256: de857d7fea6dfa3be1a526d9bdcbc5917df4a12e9ade5937da5ff7308bd36579
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to psychology and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports the malicious intent.

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=sensation+and+perception+in+psychology+pdf
    • http://files.mrksrecyclehawaii.com/uploads/1/3/1/3/131383333/tidax_bapuzali_jumavilonu.pdf
    • http://files.fourthchurchfamilies.org/uploads/1/3/1/4/131453560/786100.pdf
    • http://files.regisacademykc.org/uploads/1/3/1/3/131384442/jedesisijaneziw.pdf
    • http://files.dasanmitchell.com/uploads/1/3/1/4/131452938/2f3335b.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/19712038794.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/alien_modifier_tinkers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/subupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/business_plan_format_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8823/files/76863618274.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/88418814889.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/rudepukoxusolon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/81128215854.pdf
    • https://cdn.shopify.com/s/files/1/0448/5575/4914/files/braveheart_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/nuduvoviraxipado.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/novobakolupogitavit.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/non_alcoholic_cocktails.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/adjectives_files.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_off00008366.bin
b93231c90c17ad628eb17b2b61055d0b5d395bb796f0abf2a443bc00018072e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8366 5620 bytes
font_01_sfnt_off0000968d.bin
226ba5ff6ee4d5499992fd74d303cdd98a50b3b9716e29b6a4b68f869e5612b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968D 10316 bytes

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