Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e250f6471081025…

MALICIOUS

PDF

44.1 KB Created: 2020-08-28 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eaf342894b5cbb3aa3bc2884ab95b0c SHA-1: dada04f2223a862d7a38e7cbd081cb47013921e4 SHA-256: 8e250f64710810257911c1af4f6811e59e9c56f6c9ff5826af3237595a6d4393
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=hadoop+the+definitive+guide+latest+edition'. This URL is embedded within the document body, suggesting a social engineering attempt to trick the user into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic. While no scripts were extracted, the primary attack vector appears to be the malicious redirector.

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.com/pify?keyword=hadoop+the+definitive+guide+latest+edition
    • http://zejiforat.fyiexpress.com/uploads/1/3/1/6/131637814/jukat_lowopilemuruseb_rugajari.pdf
    • https://cdn.shopify.com/s/files/1/0435/9428/5218/files/xezuzoxogaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/rawazazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3276/files/cambridge_english_vocabulary_games_and_activities.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/dofawokadovawufedej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/berserk_anime_1997.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/7582042268.pdf
    • https://cdn.shopify.com/s/files/1/0436/4913/8846/files/gifubuxadosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/job_application_letter_for_accountant_assistant.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/libro_los_compas_y_el_diamantito_legendario.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/descargar_badoo_apk_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/suzuki_gsxr_750_2016.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe6.bin
70c2f39883a375a7f583cbe2b6a102e4d7d8469e8b98bbcd85d75eaf42b2a6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 4064 bytes
font_01_sfnt_off00006e38.bin
3398e50062e6fac9ab1b179f9727f027160ed69ebb4688144ebb9ba1ec4e7f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 5228 bytes
font_02_sfnt_off0000800a.bin
8dbb1abdb8f42403875484a7169a2c1bd2ac981b4cfbd5b55e4705fc7dabbc09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 10220 bytes

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