Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72cd84469f78356…

MALICIOUS

PDF

47.0 KB Created: 2020-09-19 00:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b5f584c4ca15e1bd4ab341776e4290 SHA-1: b5f4eb6409132f42ff28336a31f22c4e13ef7bb4 SHA-256: f72cd84469f783561e964cda7e8e3f76bcb2980407b2ec60cec22ddb072a3021
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body and embedded artifacts suggest it is part of a link farm strategy, with numerous links pointing to external resources. One primary malicious URL identified is https://ttraff.club/wix?keyword=unit+7+worksheet+part+1+dna+structure+and+replication, which is likely used to lure victims into clicking through to a compromised site.

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.club/wix?keyword=unit+7+worksheet+part+1+dna+structure+and+replication
    • http://tanawivaf.chrismhoward.com/uploads/1/3/0/7/130775050/rapetibupig-pipakoxadi-genixotawowefu-xilogusozesu.pdf
    • http://muzuwoz.mondaydesignstudio.com/uploads/1/3/0/7/130775478/tujixitogisureb-mokukozagezos.pdf
    • http://files.parksummerprograms.org/uploads/1/3/0/9/130969981/betazerunuguda.pdf
    • http://bifar.katastrophique.com/uploads/1/3/1/6/131607095/ditokesikaki-vuguruk-fexipaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/bioaccumulation_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/jeopardy_tv_show_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8810/1030/files/85111110111.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/xamenef.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/kovutipususufuse.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/bolil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5363/files/appleseed_alpha_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/free_gate_vpn_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/58880190391.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/12951127097.pdf
    • https://9197ba9b-053d-4d54-a674-a013f5e2aa43.filesusr.com/ugd/28b3f7_7a61ef13e8f84cc49ebebcb09d1e17f8.pdf?index=true
    • https://5cefe2db-0b8c-42d6-9816-21f5dfa0a6f9.filesusr.com/ugd/ee4d88_5e232de338ad474ebdcd381f8e6d6dfd.pdf?index=true
    • https://2c351d34-0b5c-48dc-978a-a024783418f9.filesusr.com/ugd/10b11f_dc67d7a04d754a9893314abced9b5dcd.pdf?index=true
    • https://9d6bea58-7532-46fe-a2ae-c6531d6b3ca2.filesusr.com/ugd/599026_e468e26a2d6a4b68a3bd60cabfae4012.pdf?index=true
    • https://9a5850f9-8d00-431f-b5ac-ae0eca6d0024.filesusr.com/ugd/e4a001_0d65b08edb04417aadfbb21cc913cd43.pdf?index=true
    • 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_off000078d0.bin
7759506ee1754f432cc71369fa9aa308e4ef118e2bec9e4a3c4d3c7941a7b35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 5440 bytes
font_01_sfnt_off00008b6f.bin
8211eedd7a386119794b5a1a8eb0d1246f694d25c61e32d3eb460bc2a9f62b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 10124 bytes

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