Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18825668b7b91ba…

MALICIOUS

PDF

38.3 KB Created: 2020-07-10 05:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17c08aa5352052d5feba6f415608bab0 SHA-1: 18c7de72e26081993165d05cd61aab1ce7c8ecd2 SHA-256: a18825668b7b91ba3bc115b35c51556737d8afa7c09721b356e689c33df9d03f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One of the primary links redirects through a known malicious redirector, ttraff.cc, suggesting a phishing or malware distribution attempt. The document body text and embedded links are designed to lure users into downloading further malicious 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.cc/wb?keyword=baixar%20livro%20fortaleza%20digital%20pdf
    • http://files.chadandre.com/uploads/1/3/0/9/130969052/719577.pdf
    • http://files.firestartergraphics.com/uploads/1/3/2/7/132741045/749fde7849.pdf
    • http://files.oipelmiracorning.com/uploads/1/3/1/6/131606963/jiduvebanemelun-dakipozenuxu-lumowozavuwit-rawudagopasewu.pdf
    • http://files.louisianafur.com/uploads/1/3/1/3/131379789/gaponowezufuja_lokidose_bipapotudukero.pdf
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://files.umbrapoodles.com/uploads/1/3/0/7/130775752/7259487.pdf
    • http://files.allianceunitedgroups.net/uploads/1/3/2/6/132695489/0a581f54205.pdf
    • http://files.fortyhours.com/uploads/1/3/2/8/132816041/63b84266.pdf
    • http://files.momentcapture.net/uploads/1/3/1/1/131164272/ce462aed.pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • https://zukibokukiki.files.wordpress.com/2020/06/48892277176.pdf
    • https://jurutetufot.files.wordpress.com/2020/06/fiwafenimujaselejufi.pdf
    • https://duvopuzuti.files.wordpress.com/2020/06/tinoxutu.pdf
    • https://relotudop.files.wordpress.com/2020/07/sigataronuji.pdf
    • https://fatafujuk.files.wordpress.com/2020/06/95045189901.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wojifuxazax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58580374151.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000591c.bin
b3ad313e3c7e51b42e6e7df9b7eaba739cbbbeed992f31650907434e70e527a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591C 4940 bytes
font_01_sfnt_off00006a0f.bin
a6bdce531982b5e0d364eb46328aac0724510736a1303ce42de6535107626a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 9956 bytes

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