Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2aea9650122c93…

MALICIOUS

PDF

36.7 KB Created: 2020-08-25 08:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b62f94b0be389cad4dfc3f5d495e0b6a SHA-1: 8ab640be0cdcf31f26556a9a61db9a3fd3350d51 SHA-256: 5a2aea9650122c934264563d144c501a6de0afc9b360205dfb9ccbae71049e4f
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. Many other links point to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. While the document body is heavily obfuscated, the presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lucida+calligraphy+font+family+free
    • http://bewina.tom-buckland.com/uploads/1/3/1/6/131607163/8584277.pdf
    • http://files.bamboobabyboutique.com/uploads/1/3/1/3/131398010/6156352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/arduino_programing_language.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/auditoria_administrativa_libro.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/losamezu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/wupupilumos.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/35449145295.pdf
    • https://cdn.shopify.com/s/files/1/0448/3471/7858/files/lumuwurojege.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/pokemon_showdown_teams_ou.pdf
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/block_abdominal_ultrasound_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/federal_bank_aptitude_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/ruvonabirole.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/dokowimawexoduwen.pdf
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/27827142813.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_off00004ffb.bin
db88f20e010da22eea017f3432e88a4732e4bb62d50f660602d6d8e8fcfcc5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFB 5432 bytes
font_01_sfnt_off00006253.bin
e95de8c95b531279560dc444dae7c8a874da14443471992d3b0618829df6d10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6253 10536 bytes

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