Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ce955ea16aab81…

MALICIOUS

PDF

46.7 KB Created: 2020-08-14 03:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62b698499af0e0b83b25e8b8b215341c SHA-1: f67750108ee42f3c30719f9aeae4fded13955ac4 SHA-256: 68ce955ea16aab818a7836319e3eb6de35d757fb5d8036e5ed1108258186b366
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link, indicating a malicious intent to direct users to potentially harmful content. The embedded URL 'https://ttraff.ru/pify?keyword=template+of+motivation+letter+for+scholarship' is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to scholarship motivation letters, likely serving as a lure.

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=template+of+motivation+letter+for+scholarship
    • http://files.winwithwill.com/uploads/1/3/0/9/130969580/7032533.pdf
    • http://files.cabincreekanimalhospital.com/uploads/1/3/1/4/131437376/duganesulirunen-pukuzupubu-tababumorovewi-gubasevaf.pdf
    • http://files.electrolarynx.com/uploads/1/3/1/6/131637546/petonimefedife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/tivetotinekakakumipadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/dimozugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/pibawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/91329990409.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/99058764272.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/44115029977.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/william_stallings_operating_systems.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/concrete_admixture.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0532/files/18484803643.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_off000076f8.bin
deff5cf092e752f79ae6d1bd4fddb51ee640894aa34ef2cd5442bf0fca0b1cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 5264 bytes
font_01_sfnt_off000088be.bin
58dce284407eb4b5516d3458ab9061075c324b57c1a62d0a8f643efec2e7cef2
pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 10820 bytes