Malicious PDF — malware analysis report

Static analysis result for SHA-256 19681a2ab231cbdb…

MALICIOUS

PDF

45.6 KB Created: 2020-08-21 10:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61cb0371cc5c1f81d4d2c6f9550c7e1f SHA-1: 52fd627bbf02f3edc906dc2524c134434695cb98 SHA-256: 19681a2ab231cbdb7446c9c2cf4fb0b919f9a20d816134f540390e011be84c34
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link to 'ttraff.ru', indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the same URL and references an 'autopsy report', likely a lure. The ML classifier strongly flagged this PDF as malicious, supporting the redirection attack pattern.

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=melanie+coleman+autopsy+report
    • http://files.heswallhoneyswi.com/uploads/1/3/1/6/131607310/07409.pdf
    • http://files.harrylsymons.ca/uploads/1/3/0/7/130775903/xurin-sunesa-sejubo-kakoxuwinulasuk.pdf
    • http://files.hlgroen.com/uploads/1/3/2/6/132682295/tekolowinofezi-megusewujo-rafufotado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/census_2020_gradeup.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/83360411812.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/jodorowsky_s_dune_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/73392862205.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/nkjv_study_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0734/files/3392689722.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/download_acrobat_reader_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/fusionner_excel_vba.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/7256880128.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/barbituricos_anestesiologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/ggplot2_volcano_plot.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/cooling_tower_diagram.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_off000067ca.bin
aa12cfa6ce5da75ceabf54d26341689bdd472d5cd35779e2974fd321d323f061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 5068 bytes
font_01_sfnt_off000078ec.bin
8a25a3eafa2ad28a46b53fbb86bc47543e8c06b14bb1c27995b8c744b5ff62e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EC 10144 bytes
font_02_sfnt_off00009bad.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAD 4324 bytes

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