Malicious PDF — malware analysis report

Static analysis result for SHA-256 0816651410d12e11…

MALICIOUS

PDF

45.9 KB Created: 2020-10-02 12:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7015dce7b1dabe4fce5d71352de13c5 SHA-1: da11932324576823bc3c973daa9579926ccefc94 SHA-256: 0816651410d12e11f2389a18a471d2568a4c1e3df597bd6bd84fd104a66d733a
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be part of a link farm designed for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the link farm.

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.link/pify?keyword=maytag+4000+series+dryer+troubleshooting In PDF document text
    • http://sorugobi.abidingingrace.net/uploads/1/3/2/8/132814930/wesug.pdfIn PDF document text
    • http://munexa.surgicaltrainingnetwork.org/uploads/1/3/1/3/131379296/mamorinup-pirito-vivala.pdfIn PDF document text
    • http://vimamog.klutchcuisine.com/uploads/1/3/1/4/131437792/xugogaxa.pdfIn PDF document text
    • http://files.mchsorchestra.com/uploads/1/3/2/6/132682090/3127920.pdfIn PDF document text
    • http://tipobar.macyouth.org/uploads/1/3/1/4/131437889/a6976348b24.pdfIn PDF document text
    • http://files.brennahelm.com/uploads/1/3/1/3/131383318/maxizololepu-falogenisamefo-ronelig.pdfIn PDF document text
    • http://files.mrhowe.org/uploads/1/3/1/3/131397934/236efa.pdfIn PDF document text
    • http://files.photographybydicklund.com/uploads/1/3/0/7/130775734/timopijarituve-sijajefepane.pdfIn PDF document text
    • http://roputoka.ingridlavoiepapercutting.com/uploads/1/3/2/6/132681746/dezazubewoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb61f62c-c811-492c-b0eb-e42366ea864e/jarugux.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 5564 bytes
SHA-256: 3f0afda8eb3cad1b3c1922299b109a93e159873e9c91bad3662c2e03058147fe
font_01_sfnt_off00008737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8737 10528 bytes
SHA-256: 566eb2ce2d33664e1b04d151c305d545697435b89288cc77daf4730f10a8ecda

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