Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a43e2104c5fa6a5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-23 07:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd43ca07383e0407025432b45a6cfde SHA-1: dcfd73723c4ee563e847ec0715e09902657a6e77 SHA-256: 6a43e2104c5fa6a5073ceb88dbe185a17ca0f396090ca98c285843f5ed91bb84
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=kundli+software+free++for+windows+8
    • http://ziperi.louisianacareerdevelopment.org/uploads/1/3/0/8/130814328/negemobuwevunajun.pdf
    • http://navew.taiwanhotelnews.com/uploads/1/3/0/8/130813714/pumenixuwifo.pdf
    • http://files.globalbookrights.com/uploads/1/3/0/7/130776795/a3e0744f8.pdf
    • http://files.bvcpsedtech.net/uploads/1/3/1/6/131607662/vetovaked-ketamaneta-salosuriner-sofaluj.pdf
    • http://files.blairmielnikdesign.com/uploads/1/3/0/7/130739247/5e02b27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/97402272383.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/accident_reporting_ontario_insurance.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7545/files/fanose.pdf
    • https://cdn.shopify.com/s/files/1/0438/0449/1937/files/46144347342.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/algebraic_fractions_gcse_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/16874895957.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/blockchain_game_apk_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/impact_of_climate_change_on_agriculture_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/robefanalijezakop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c4.bin
99d6383b7518bca8ed9f894c248b6735761cbc8d4efe51c23eca09b96ef2dc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C4 5036 bytes
font_01_sfnt_off000086ff.bin
6edb84ebb312fe7dccee995bbe3483a999aeb64bc69060ff3ad6e4ac005d0fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 10256 bytes
font_02_sfnt_off0000aa0e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0E 4324 bytes

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