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) First seen: 2020-08-25
MD5: 85fb5aca8a39ea993c36cdb0c663df59 SHA-1: a8732aa3743743d65ecf9e4d103436be3b265c0d SHA-256: 0a13710e36596cc45b56f83e1d3578d0de3922fc72727525945a32c44d56cfa5
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the primary attack pattern involves leveraging link farms and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.wimpyworthing.com/uploads/1/3/0/9/130969459/kugadak.pdfIn PDF document text
    • http://files.wildaboutspain.com/uploads/1/3/1/8/131871956/9620279.pdfIn PDF document text
    • http://files.soduparentsposse.com/uploads/1/3/1/1/131163772/kusoxekoxilak.pdfIn PDF document text
    • http://files.lwetherbee.net/uploads/1/3/1/3/131380001/9ba269340.pdfIn PDF document text
    • http://files.edgertoncentermakerspace.com/uploads/1/3/1/3/131380723/worigibutasivid.pdfIn PDF document text
    • http://files.fccbluffcity.com/uploads/1/3/1/4/131438682/2756839.pdfIn PDF document text
    • http://files.meetprojectsound.com/uploads/1/3/1/6/131637219/majudada_niforuzulakodi.pdfIn PDF document text
    • http://files.novelideasbylaura.com/uploads/1/3/1/4/131438682/lakizel_bazurekaf.pdfIn PDF document text
    • http://files.mathgiraffe.com/uploads/1/3/2/6/132682640/mibopuwarexefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pizevalipure.files.wordpress.com/2020/07/59250834377.pdfIn PDF document text
    • https://sanewosok.files.wordpress.com/2020/07/18432203924.pdfIn PDF document text
    • https://nogekidopof.files.wordpress.com/2020/06/92521466548.pdfIn PDF document text
    • https://nadofof.files.wordpress.com/2020/07/morumekakanulutemi.pdfIn PDF document text
    • https://vofugoseso.files.wordpress.com/2020/07/21201167708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/20274537120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/bijibolorilob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/30569768918.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5392 bytes
SHA-256: 94f956ce6eaa6c41e44fa656106f2aa6a7fe0bb5f1f15aaacee6b1b1b09141ff
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10340 bytes
SHA-256: a04f1040338cbb33193eebfd5a212bdaa065f40a1152a7c3b0d59ed3987ed33b

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