Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4d790e20703ae…

MALICIOUS

PDF

44.6 KB Created: 2020-08-20 03:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfdd4fc23a8abebd19f98b7873ced59b SHA-1: 50c9025d11a8ff2f14d6c45e44aecb1b674368a3 SHA-256: feb4d790e20703ae1dbe588f5519dadb62b4f8acfa2fae7f0bd16af25870e607
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to malicious infrastructure, disguised with text related to depression screening guidelines. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the malicious URL, suggesting a phishing or redirection attack.

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.com/pify?keyword=acog+depression+screening+guidelines
    • http://rosidub.falconeerkennels.com/uploads/1/3/0/7/130775795/lizozubozorize.pdf
    • http://files.satellitecityhall.com/uploads/1/3/2/6/132683264/pifed_jixesebezawazap_rovorivuv.pdf
    • http://files.jdeducation.org/uploads/1/3/1/0/131070973/kipinixuzowetofota.pdf
    • http://files.monteaglemonarchs.com/uploads/1/3/0/9/130969657/wujotabifudibof.pdf
    • https://cdn.shopify.com/s/files/1/0432/0165/9043/files/38805468255.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/science_fusion_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/mathematics_in_the_modern_world_cengage.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/84253842639.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/66116349000.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/37793014044.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/loose_cannon_def.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/liwadobupezu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/18187595919.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/59314767044.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/basic_english_usage_edicion_espaola.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/93720964439.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/zefeduzoxisazoxafetutejoz.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_off00006ef4.bin
82beebe82d3eb548104dd85c17633d1a14df89b257de057189043f5a2b133bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 5020 bytes
font_01_sfnt_off00008016.bin
dcb1241bc2ddd7366eb6908b90abf7a6db0e419184b6abc2eff24640a178a839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 11060 bytes

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