Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5b1211b61b83e4…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 05:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b19a5f1310d7ee9004017f52588a3da SHA-1: 39db4de06f0f79ba5ee15823ceaf4b1d4c1f0420 SHA-256: 5b5b1211b61b83e4e8af75960a56c85cc303e47716b96285867564dc2fa81986
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards malicious intent, likely related to phishing or malware distribution.

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=tsotsi+athol+fugard+pdf
    • http://files.11across.com/uploads/1/3/0/7/130738619/mopupolel.pdf
    • http://files.sfautismsociety.org/uploads/1/3/0/8/130814229/85336.pdf
    • http://files.fallbrookfoodpantry.org/uploads/1/3/0/8/130813931/tetaxamavozidod.pdf
    • http://files.artistlyne.com/uploads/1/3/1/0/131070588/4e422f4a.pdf
    • http://files.startingblocksplus.org/uploads/1/3/0/7/130740524/3209941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/favavowow.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/23602086732.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/30403771169.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xaxigeruver.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/24244129376.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7897/files/62279299670.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/12632915399.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/12426326405.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/kewusenujigupisum.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/bipavunorunoraxuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/gates_belt_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/rixitutuvejibedazisujoxa.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_off00007065.bin
039d9be06e08d6d09cf284be6afd70c4b83027742a340cecbbc066a4aaef8bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7065 5252 bytes
font_01_sfnt_off0000823b.bin
fe5d063c228aafa646e253c6f7110e0b2767a809828e17936f66746db227b25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823B 10072 bytes

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