Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5befa6e46b9ff38…

MALICIOUS

PDF

43.4 KB Created: 2020-10-30 11:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2258323c13a24642cc13a20a43b2c42 SHA-1: 580109aa5170dc6abbfc635f765b8780a5c70ff6 SHA-256: f5befa6e46b9ff38accf7e4f9ed3a14330652f7f913c1f2712a13618b3788281
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, which is part of a link farm designed to host numerous external PDF documents. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the PDF is used as a lure to direct users to malicious infrastructure, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?keyword=sam%2527s+club+gazebo+style+swing
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f870cf5197d3.pdf
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/342ee59e.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f9a4f4c55c8c.pdf
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/dolib.pdf
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f9126fb43fa6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9847/0555/files/benagezewojojo.pdf
    • https://uploads.strikinglycdn.com/files/65a6bbda-37f8-4d45-82e1-1e99679fd067/universidad_ana_g._mndez__campus_florida.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/fufifuwejofuvones.pdf
    • https://cdn.shopify.com/s/files/1/0496/0573/8660/files/community_script.pdf
    • https://cdn.shopify.com/s/files/1/0476/6384/1446/files/9046642163.pdf
    • https://cdn.shopify.com/s/files/1/0498/5526/6978/files/persona_4_judgement_sword.pdf
    • https://cdn.shopify.com/s/files/1/0505/5335/6485/files/perception_pescador_pilot_12_manual.pdf
    • https://cdn.shopify.com/s/files/1/0502/3426/1679/files/62042547297.pdf
    • https://uploads.strikinglycdn.com/files/6805d637-df06-4f1e-b9b8-e71220cdb69a/26766030671.pdf
    • https://cdn.shopify.com/s/files/1/0500/2510/3549/files/sifezelufexi.pdf
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/tunein_radio_pro_apk_mod.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006952.bin
ff2898fc5279f1320af811f5131e4a9146e10d4fd30629b0eff04f0c8564be3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 5544 bytes
font_01_sfnt_off00007c47.bin
a4bbc5b9310c54786e1cb31360302e9794afb5532231baf60e6808f068454d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C47 10652 bytes

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