Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83f415bbad5460d…

MALICIOUS

PDF

44.5 KB Created: 2020-08-04 10:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89e1bda46dd66e75263d1d78ae6e5e7 SHA-1: 1640ca5c93aef3873ddf229647e74902e825bab1 SHA-256: b83f415bbad5460d0e27513fef67e71ba54baee930f756de4bb23026a6c27199
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cooling tower troubleshooting pdf' and the malicious URL. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and the ML_NYX_PDF_MALICIOUS flag strongly indicate a malicious intent to redirect users to harmful content. The file likely serves as a lure to a phishing or malware distribution site.

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/pify?keyword=cooling+tower+troubleshooting+pdf
    • http://files.senseconstructions.com/uploads/1/3/0/7/130739308/zemesixozuju.pdf
    • http://files.juvimaxadventures.com/uploads/1/3/0/7/130739686/7680264.pdf
    • http://files.piedmontgreencbd.com/uploads/1/3/1/4/131406715/nalakifaseko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39843759369.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/4946074244.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/greenhouse_effect_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0434/6527/7605/files/google_user_id.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/tagekoruwuvoname.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/zilazitatevodusibarebiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/convert_to_word_arabic_font.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/99607912761.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/94617468625.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/42864619222.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/40484174179.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/62014446681.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/38910029299.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/brche_erweitern_aufgaben.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_off00007188.bin
b4dcffea36b3c1d7a6456761a99d19fb4437006ec589788a6a8128cc0b9e35af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 5228 bytes
font_01_sfnt_off00008356.bin
72583120c0623e933a9b7598ee880e1cb694bed3aa593cb5e104aade337f9031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 9820 bytes

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