Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa693234351b359…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 23:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305e7071217f3fbd5fc58875658aa2a4 SHA-1: c82de0bb3ae96fafb2a08beb4dbbfc3c4e5a9aca SHA-256: 3aa693234351b35939d234b1af56bc23f983815483dc3c39b2f8978c280d7b1e
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=hotel+brochure+sample+pdf'. The document body, though heavily obfuscated, contains text related to a hotel brochure and includes numerous external links, many hosted on shopify.com, but also includes suspicious domains like 'femoni.stephenvince.net'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for malicious redirection 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.com/pify?keyword=hotel+brochure+sample+pdf
    • http://femoni.stephenvince.net/uploads/1/3/1/1/131164312/motatirajujira.pdf
    • http://files.csuwritingproject.net/uploads/1/3/2/6/132696117/tanej-wisipiximoluneg-misavavi-jonazufuwax.pdf
    • http://files.hamptonplaceclt.com/uploads/1/3/1/8/131871494/860063.pdf
    • http://files.sloco.org/uploads/1/3/2/6/132681880/6686878.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/58680787582.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/wenobolusexokusokijawoda.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/1684081336.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/posudixunij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/zelegowoxetexezezuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/bikadatuxujije.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/mastering_metrics_full.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/log_and_antilog_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesibilefonupas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/demasiados_abogados_piero_calamandrei_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/88487174280.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/nugurozimujajok.pdf
    • https://cdn.shopify.com/s/files/1/0429/7824/6815/files/3183960302.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006323.bin
7eb2d15eb1e7cdbc51e2582a94f1899f293693f960aa2f63f5c11521e21354bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6323 5496 bytes
font_01_sfnt_off000075aa.bin
b8144aae221dae0f76bd3e99aa5f16ba0125841e35189cfe9293dbe5cb70702e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 10488 bytes

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