Malicious PDF — malware analysis report

Static analysis result for SHA-256 650a421d4f17609e…

MALICIOUS

PDF

79.7 KB Created: 2021-01-19 12:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c70d77b8722d32b467d322b68ffafd4 SHA-1: 99fe23e1f3bf0ad777c64c0f272853442777f29c SHA-256: 650a421d4f17609e268fd8982d6da13318bd19e8960be8f61f3938e9b76c03a2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://traffnew.ru/123?utm_term=draw+a+snowman+with+your+eyes+closed+game', is likely a malicious landing page. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with common malicious PDF distribution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=draw+a+snowman+with+your+eyes+closed+game
    • https://site-1172777.mozfiles.com/files/1172777/70728247528.pdf
    • https://site-1168018.mozfiles.com/files/1168018/78161039880.pdf
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fcf6b693ee82.pdf
    • https://cdn-cms.f-static.net/uploads/4500889/normal_5fae30f5cfcc7.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/velakamemapizovobu.pdf
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/5198304.pdf
    • https://venumokup.weebly.com/uploads/1/3/4/8/134866871/samutugufe.pdf
    • https://static.s123-cdn-static.com/uploads/4420752/normal_60011f0732c72.pdf
    • https://site-1195811.mozfiles.com/files/1195811/fugijilane.pdf
    • https://site-1172540.mozfiles.com/files/1172540/adobe_reader_gratis_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4494893/normal_5fb2b6e367181.pdf
    • https://site-1175507.mozfiles.com/files/1175507/81996290385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lulelepese/graphing_calculator_app_for_iphone.pdf
    • https://s3.amazonaws.com/lijopavexanuse/13644169174.pdf
    • https://s3.amazonaws.com/wonoti/monitoring_and_evaluation_written_test.pdf
    • https://s3.amazonaws.com/patotale/bengali_movie_annadata_full_movie_free.pdf
    • https://s3.amazonaws.com/jimugivos/centralia_il_weather_report.pdf
    • https://s3.amazonaws.com/zevutebulaworel/77702267156.pdf
    • https://s3.amazonaws.com/sulasatevirexo/balancing_act_practice_worksheet_science_spot_answers.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_off0000f10f.bin
743fddc6077e068bf848b31a21bfb6b9d1cb42755880a7c1f5d41d6665170edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 5544 bytes
font_01_sfnt_off000103d6.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 1800 bytes
font_02_sfnt_off00010c64.bin
5ad2d1fea2a54a301d8337bd79570d69cc152999cb40876fc6511ef1c9c9d9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 10592 bytes

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