Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a13710e36596cc4…

MALICIOUS

PDF

71.5 KB Created: 2020-07-11 03:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85fb5aca8a39ea993c36cdb0c663df59 SHA-1: a8732aa3743743d65ecf9e4d103436be3b265c0d SHA-256: 0a13710e36596cc45b56f83e1d3578d0de3922fc72727525945a32c44d56cfa5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=csat+2016+answer+key+pdf
    • http://files.wimpyworthing.com/uploads/1/3/0/9/130969459/kugadak.pdf
    • http://files.wildaboutspain.com/uploads/1/3/1/8/131871956/9620279.pdf
    • http://files.soduparentsposse.com/uploads/1/3/1/1/131163772/kusoxekoxilak.pdf
    • http://files.lwetherbee.net/uploads/1/3/1/3/131380001/9ba269340.pdf
    • http://files.edgertoncentermakerspace.com/uploads/1/3/1/3/131380723/worigibutasivid.pdf
    • http://files.fccbluffcity.com/uploads/1/3/1/4/131438682/2756839.pdf
    • http://files.meetprojectsound.com/uploads/1/3/1/6/131637219/majudada_niforuzulakodi.pdf
    • http://files.novelideasbylaura.com/uploads/1/3/1/4/131438682/lakizel_bazurekaf.pdf
    • http://files.mathgiraffe.com/uploads/1/3/2/6/132682640/mibopuwarexefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pizevalipure.files.wordpress.com/2020/07/59250834377.pdf
    • https://sanewosok.files.wordpress.com/2020/07/18432203924.pdf
    • https://nogekidopof.files.wordpress.com/2020/06/92521466548.pdf
    • https://nadofof.files.wordpress.com/2020/07/morumekakanulutemi.pdf
    • https://vofugoseso.files.wordpress.com/2020/07/21201167708.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/20274537120.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/bijibolorilob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/30569768918.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_off0000db3a.bin
94f956ce6eaa6c41e44fa656106f2aa6a7fe0bb5f1f15aaacee6b1b1b09141ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5392 bytes
font_01_sfnt_off0000edb3.bin
a04f1040338cbb33193eebfd5a212bdaa065f40a1152a7c3b0d59ed3987ed33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10340 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.