Malicious PDF — malware analysis report

Static analysis result for SHA-256 868a13c900d782ad…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e1f64c3e7772ff6dbc047363c812fa SHA-1: 062eb8d3f7fbe8d965996e1c335eca5ba8fed210 SHA-256: 868a13c900d782ad05808b61b71220b68ab1b72c301363d1642075393f828348
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a "free fire safety worksheet" and a URL that aligns with the malicious redirector. The presence of embedded links and the malicious redirector suggest an attempt to lead the user to a compromised site, likely for further exploitation or phishing.

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/wb?keyword=free%20fire%20safety%20worksheet
    • http://files.montanahorsesandmules.com/uploads/1/3/2/7/132741334/578f5af509c23.pdf
    • http://files.jacqueline-lin.com/uploads/1/3/0/9/130969148/3aa4d74823d5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/groin_strain_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/multivariable_calculus_10th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/nasoviduwobenawawalizi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/26957679930.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7670/files/benchicou_bouteflika_une_imposture_algrienne.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/69865119118.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/kegefoj.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/gowitisilanamugigi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/5686255409.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2196/files/takeref.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/health_sanitary_inspector_books_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/acido_acetico_en_vinagre.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_off00006126.bin
b2af65f0c1baa440c0ad8315c6673d64e33387849f746029d22aa8e900acb48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6126 4716 bytes
font_01_sfnt_off00007152.bin
89d94a2de6fb702aecfa6d02bb26f5be0e704cc30ac1a8195dd97bc3e6dd20e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 10120 bytes
font_02_sfnt_off000093f0.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F0 4324 bytes

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