Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfd4929bd29039a…

MALICIOUS

PDF

53.7 KB Created: 2020-07-09 05:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf4b5f1a83c56b7d6c61f9a0886a1dc SHA-1: 35f7efd1f90aa38767b8e7548d04959bf05b7140 SHA-256: 6dfd4929bd29039acac0c9dcb69a8b708c86e7aff5ae9b98de87be2aa467ab3c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is designed as a link farm, likely to manipulate search engine results or direct users to malicious sites. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful 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/wb?keyword=gluconeogenesis%20pdf%20files
    • http://files.dallasbrunchclub.com/uploads/1/3/1/3/131379740/137341eac35bde.pdf
    • http://files.wyomingspeechlanguagehearingassociation.org/uploads/1/3/1/4/131409709/fudokef-kagiwomajapaj-xixamez-vipajadimagom.pdf
    • http://files.badassbookbox.com/uploads/1/3/0/9/130969034/2877523.pdf
    • http://files.oace.co/uploads/1/3/1/3/131381781/parotakime.pdf
    • http://files.stlpti.com/uploads/1/3/2/6/132683088/5502f414b.pdf
    • http://files.thewardrobeclothing.com/uploads/1/3/2/3/132303075/giwipeb.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.heartofillinoisorff.org/uploads/1/3/1/3/131379371/9586210.pdf
    • http://files.agingwell360.com/uploads/1/3/2/7/132710671/9171565.pdf
    • http://files.wmalumniweekend.com/uploads/1/3/2/3/132303075/fosibilukuposi.pdf
    • http://files.rhythmjackson.com/uploads/1/3/2/6/132696263/94969.pdf
    • http://files.ninjamagik.com/uploads/1/3/0/8/130874629/jatupisejumelovavog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://namilarom.files.wordpress.com/2020/06/93698585725.pdf
    • https://dezulav.files.wordpress.com/2020/06/wojapotipubifo.pdf
    • https://jofesosab.files.wordpress.com/2020/07/zorufad.pdf
    • https://lirizokese.files.wordpress.com/2020/07/doxozamiwivuwazewatas.pdf
    • https://bobunob.files.wordpress.com/2020/06/38005240974.pdf
    • https://xokiwija.files.wordpress.com/2020/07/41250925627.pdf
    • https://zagufebaja.files.wordpress.com/2020/06/42851531994.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.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_off0000927f.bin
5ec7a4fe164757f4f3a65caefbf2783012a6fff338026d7ef28f831a948033b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927F 4848 bytes
font_01_sfnt_off0000a311.bin
140fe8568942470ad90c099405b3a601dcbfb5746a58e32c27afa89b0a3e42c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA311 11772 bytes

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