Malicious PDF — malware analysis report

Static analysis result for SHA-256 03082894d3319a36…

MALICIOUS

PDF

44.1 KB Created: 2020-07-09 06:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67e236cb673c788b5aa312ef675d7c7 SHA-1: 1aa22b60a5792a70cb3f6c0269d9cd1e884e1334 SHA-256: 03082894d3319a36414978434f86ceb9e86e1804e997819adbadcc2f017cfb9d
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 pointing to external PDF files, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=nephron%20structure%20and%20function%20worksheet'. The document body, though partially corrupted, also contains this URL, suggesting the primary purpose is to redirect users to potentially harmful content. No scripts were extracted, but the extensive link farm and redirector usage strongly suggest malicious intent.

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.cc/wb?keyword=nephron%20structure%20and%20function%20worksheet
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdf
    • http://files.dearborn411.com/uploads/1/3/2/7/132740860/xokagilo.pdf
    • http://files.dnaleatherwa.com/uploads/1/3/0/7/130738814/8327209.pdf
    • http://files.gowersartclass.com/uploads/1/3/0/9/130969993/5157883.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • http://files.afmsupplements.com/uploads/1/3/2/3/132302815/972851.pdf
    • http://files.lewiswarburg.com/uploads/1/3/1/3/131379115/vaxikofojenitovozex.pdf
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdf
    • http://files.blackonsilver.lt/uploads/1/3/1/4/131437733/wigaremevekel-bavodivuj-lisazuraru-dasuji.pdf
    • http://files.benyoungerman.com/uploads/1/3/1/4/131437454/sukivararezigagemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lusenexovaj.files.wordpress.com/2020/07/xotajexokatofemewet.pdf
    • https://gavomibew482746657.files.wordpress.com/2020/06/gafujurabomigiviwupara.pdf
    • https://xofosawe.files.wordpress.com/2020/07/83275123725.pdf
    • https://banisozix.files.wordpress.com/2020/07/juvadoguwamolelugogo.pdf
    • https://ruponola.files.wordpress.com/2020/06/sawepuju.pdf
    • https://kufexetironi.files.wordpress.com/2020/06/61224877747.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.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_off00006f10.bin
0344afef6f2a7efe8eba1218d1e26f817368913ffbac11ad9b044b78092d28a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 5216 bytes
font_01_sfnt_off000080de.bin
d96718ce99b8bf1426bcae8b5d39b80daf6f257452482633f10ac862c5fd1914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 10012 bytes

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