Malicious PDF — malware analysis report

Static analysis result for SHA-256 6411bae592c8f548…

MALICIOUS

PDF

45.7 KB Created: 2020-08-13 19:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea77fa80489c868d4ba776b2636d04b4 SHA-1: d209a2c7563cbc0ea1b1f29df9138392b138a091 SHA-256: 6411bae592c8f548de681ff998cc3d5928c76d6885d8ff89685f92969510920c
170 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to a manual, combined with urgency language. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=strato%20lift%20trx-13%20manual
    • http://luzagaze.k12voip.com/uploads/1/3/1/3/131383483/kabufab.pdf
    • http://files.acefortune.com/uploads/1/3/2/7/132741322/857500.pdf
    • http://jilevefu.calvarydifference.com/uploads/1/3/2/8/132814930/6847567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/tofisut.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/le_bourgeois_gentilhomme.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/foxepoliveji.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/saganedimubexukoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/68618659634.pdf
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/99780159870.pdf
    • https://cdn.shopify.com/s/files/1/0428/7823/8886/files/panchatantra_stories_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/xuzodulet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/jularaxonig.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/lofajakiduwok.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/48558186400.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/88123188184.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e1.bin
1a0a37b9f9be8cf40729fa122f5d60d07ad89dede876296b5bdfca9345578093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E1 4916 bytes
font_01_sfnt_off00007780.bin
c7a68cad2887bcd4ae31f35fee544fe38badcebd64df2db399c4de53ae492da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 10736 bytes
font_02_sfnt_off00009be9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE9 4324 bytes

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