Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fe345ba6794187…

MALICIOUS

PDF

37.1 KB Created: 2020-09-16 21:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0322ed1b2b9412efde7f17d9c496350b SHA-1: 6bc3e3e817674c60a151fdb7a1101bffd1c1bb3f SHA-256: 14fe345ba6794187a50a85d616955887f741599fb6559407edab90bb01bc084f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text suggesting it is an answer key for a financial algebra textbook, likely a lure to encourage clicks. The primary malicious URL identified is a redirector, which is a common technique for distributing further malware or phishing content.

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/wix?keyword=financial+algebra+advanced+algebra+with+financial+applications+answer+key
    • http://files.rsvpvolunteercaregivers.org/uploads/1/3/2/6/132681824/navate.pdf
    • http://files.cyspringstheatricalcompany.com/uploads/1/3/0/7/130739898/tijene_musubunedo.pdf
    • http://zopevopi.rv-14a.net/uploads/1/3/1/4/131454190/9e5899910d5b35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://77def252-139b-483d-b69f-3457d6bbf25a.filesusr.com/ugd/debdc1_d58c14dc607a4f74be40d1b2e5df340c.pdf?index=true
    • https://53887144-dcc7-4c94-a25c-58f42e70b2c7.filesusr.com/ugd/6f7357_f586c16f96054383866c8be4a3d7b1d8.pdf?index=true
    • https://3066b962-9e8b-4ff1-9635-9e04055533e5.filesusr.com/ugd/738632_5ff277d06eba40a7b674d40ec84c9981.pdf?index=true
    • https://52693125-699a-4c0e-9391-3b1fd9a0003b.filesusr.com/ugd/8e7730_dfe0197407e148f6b18f6be3a141e5b9.pdf?index=true
    • https://a2c2cbba-3767-43f9-bcc1-dca1eb807e0d.filesusr.com/ugd/162fe6_37098414a6444bddad1229ca76a4a2bb.pdf?index=true
    • https://5ac68823-6263-48e0-973c-6261045ba4b8.filesusr.com/ugd/0286dd_418f4bd962af45419cd7136b954f51e5.pdf?index=true
    • https://dc1c645b-b503-4c07-b733-fbefce336ce8.filesusr.com/ugd/f2c1dc_392cb150a5434348b02fbccce90e847c.pdf?index=true
    • https://d79841f0-72f4-4032-9a75-658a50a71dd7.filesusr.com/ugd/b65acf_9ec6a51e6cd84cbf96d995a3892301b9.pdf?index=true
    • https://a8420077-e374-4f1d-9827-4f308c0a9c9a.filesusr.com/ugd/04e6f9_c41de70a536e4644a5517e7b01662230.pdf?index=true
    • https://70545432-771a-4e9f-bc2c-9ce55be819d0.filesusr.com/ugd/33ab24_05519f0568104230ba5b9ec0b47bb30a.pdf?index=true
    • https://b240de7a-c355-4419-921b-61e2a751a81c.filesusr.com/ugd/baef12_51a270bab75f4b749b5037d144c868dd.pdf?index=true
    • https://www.nxtbook.com/nxtbooks/ngsp/financialalgebra_advanced2ndedition
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004457.bin
6c681a379b8fc1f6d8cd0f69e5b3d4ab5ff34ec84dc8842a8b89d8e8e58570d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4457 5616 bytes
font_01_sfnt_off0000576f.bin
5c116e47a2a839bd538648641d9440ce9ce7d47b48018a3f873ba2949d6ec705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576F 9736 bytes
font_02_sfnt_off000078be.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 4324 bytes

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