Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0f09456250d3e5…

MALICIOUS

PDF

56.4 KB Created: 2020-07-07 12:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 646d64ff6d60bf5cde01b1a8c230e87b SHA-1: a989565ce2fe4a2c31081d9e62622833bc88e0c7 SHA-256: 7b0f09456250d3e59bca186fd29d9b383beb36a113af471a3c8e8e92d9fb3472
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on disposable domains. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document's structure and the nature of the embedded links indicate a coordinated effort to distribute malicious content.

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/wb?keyword=triangle%20congruence%20criteria%20worksheet%20answer%20key#triangle+congruence+criteria+worksheet+answer+key
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.comforttrainer.net/uploads/1/3/2/6/132681002/4312007.pdf
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdf
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.accountinguci.com/uploads/1/3/0/8/130873907/wafizelov-josekijaze.pdf
    • http://files.getitwright.com/uploads/1/3/0/7/130776788/pufim-fafopunatobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kumitewefa.files.wordpress.com/2020/06/jidewetotip.pdf
    • https://sunejefu.files.wordpress.com/2020/06/74427110043.pdf
    • https://luxupode.files.wordpress.com/2020/06/ribofoguwifaxat.pdf
    • https://zipovakolo364097725.files.wordpress.com/2020/06/nirerimofurevulige.pdf
    • https://susudamasot.files.wordpress.com/2020/07/73490951703.pdf
    • https://lonewer.files.wordpress.com/2020/06/setilatedideguna.pdf
    • https://wosupasojaz.files.wordpress.com/2020/06/ridukuxupulimuwozipalo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fae.bin
4ec8458a343ab4e98ffa7b392ddfd216996353bc45e1e0eb05d1f707299442fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAE 5148 bytes
font_01_sfnt_off00009139.bin
98bd197052b98149a63147bae50fab0bb41acd182963905d9c9cac58bdceae93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9139 14140 bytes
font_02_sfnt_off0000bded.bin
5afaeb39d5f06c39974779012071e80103b19eb5204bf15184e0278444506668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 16364 bytes

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