Malicious PDF — malware analysis report

Static analysis result for SHA-256 661ba9fda7375e81…

MALICIOUS

PDF

52.2 KB Created: 2020-08-24 14:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b42a0580bae012e6741a0d18c504ca07 SHA-1: 56c9401ff39a6c927004ca172532cf1304df4817 SHA-256: 661ba9fda7375e81b1875fe9003906cb6b1a5134e09c29604595817c5ea21694
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=bangla+natok+3gp++website`. It also exhibits a link farm pattern with numerous external PDF links, suggesting a spam or SEO abuse campaign. The presence of a "download button" lure further supports the malicious intent of directing users to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bangla+natok+3gp++website
    • http://fogijibef.therestthatworks.com/uploads/1/3/1/4/131483001/laxuj-pitejixonadana-fovuzofina-tiwinakofof.pdf
    • http://lafanot.kchristianson.com/uploads/1/3/2/7/132712615/5c193e.pdf
    • http://dawigo.justinedaisuke.com/uploads/1/3/2/6/132695780/2b81ae5d.pdf
    • http://temujova.dandelionhousefloraldesign.com/uploads/1/3/0/7/130775934/c1bbfa16d2e2.pdf
    • http://files.goodfaithfarmmd.com/uploads/1/3/1/4/131408056/ae7dba52b0bab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29529942485.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/business_casual_dress_code_policy.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/66858509169.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/pukapawate.pdf
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/los_caracoles_historia_de_sus_letras.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/tokop.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/massey_algebraic_topology.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/12205744672.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0762/files/second_world_war_causes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/wasanaju.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/extraction_lab_report_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0439/3431/8760/files/nibamow.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed6.bin
ad766a78bbafb07ef54915eaef067f8fcd4a77a78c2ca3dea1500d8ebd879bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5188 bytes
font_01_sfnt_off00007098.bin
af594c5af230fab23093c41ed9514017ab3f4337546f76ada9cca2c9b1e2cfc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7098 6100 bytes
font_02_sfnt_off00008462.bin
f8725d6406998e5b5bf7653a2b7c938495eb03f22f065fba6316483b997ae0b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8462 15896 bytes
font_03_sfnt_off0000b561.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 4324 bytes

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