Malicious PDF — malware analysis report

Static analysis result for SHA-256 0854bac98df23808…

MALICIOUS

PDF

38.9 KB Created: 2020-08-05 15:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a497b18272ea72b0cd97f12dc1e3b2d SHA-1: d9320b8fd3e4e3e96a48fe1fd506db9c1083eaef SHA-256: 0854bac98df238083fb7576ea02955a82b3f5fbc237b71c62baaaa1c8cd2754e
154 Risk Score

Malware Insights

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

This PDF document contains a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference a 'Seat leon 2018 manual' to entice users to click the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous embedded links suggests a SEO poisoning or link farm tactic.

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.cc/wb?keyword=seat%20leon%202018%20manual
    • http://files.simplybalanced3.net/uploads/1/3/1/4/131407469/dapem-nudanirokebar-voputu-gizakoferuk.pdf
    • http://files.onairadvocate.com/uploads/1/3/0/9/130969561/nododasoxazil-rovitoteni-soxofarozowa.pdf
    • http://files.woofjocks.com/uploads/1/3/1/4/131453245/wevawokowafodab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/mathematical_statistics_and_data_analysis_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/gotononelafoxutewuxoreb.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/39885135330.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/84777787134.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/rofuwofowofojatusalol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3512/3102/files/84445349479.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/sustainable_building_design_manual_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tuwupijisunuxavupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/57246385100.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/54639423104.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/vedasanemed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/muwetevelivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazekenikajupupapunel.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_off00005aa4.bin
5cc95f5462c40fb1e1c6a401503664fcf29bb8e3765b552e1b1f0afd2cc53dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA4 5180 bytes
font_01_sfnt_off00006c32.bin
7c0e904fa5616e29aaa80f651eda9223ad20ae03d1debe1a6b69b2c36ecc3ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C32 10240 bytes

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