Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed9aca869bee493…

MALICIOUS

PDF

54.9 KB Created: 2020-08-10 03:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 318442cee3fb0daca82677c9f4f2b316 SHA-1: 4a8778362e12eebe9b67a0657403ea62db751984 SHA-256: aed9aca869bee493aa4e050210051eb58ded0e49c543b01759b2081ad397b4c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. This suggests the primary purpose is to redirect users to malicious content.

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=hijo+de+hombre+augusto+roa+bastos+pdf
    • http://files.mindhealthconnection.org/uploads/1/3/1/1/131164313/497535.pdf
    • http://files.mrsvoigtsclassroom.com/uploads/1/3/2/3/132303359/3722dfebf9295c0.pdf
    • http://files.encorect.org/uploads/1/3/0/9/130968961/podoxelosa.pdf
    • http://fifovova.nortsstories.com/uploads/1/3/2/6/132681647/1125342.pdf
    • http://files.noahsacksteder.com/uploads/1/3/1/6/131636654/dalusujazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/la_bella_y_la_bestia_original.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/tirexofolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4896/files/31927650505.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/31136805046.pdf
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/6th_grade_math_textbook_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/25635794240.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/milwaukee_brewers_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/jidutegaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8070/files/ocr_a_level_computer_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/vijuxojugifajumevas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7595/1005/files/aditya_hrudayam_in_telugu_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/javascript_trim_string.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009686.bin
09fa9ff08bb7a85ea3f9c00f2343f56b63067584c67ffb1abed50d24df8865c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9686 5600 bytes
font_01_sfnt_off0000a961.bin
71e01f31c1fa8cc363b45e3c993004a2b13952a2583d985d15c2bb590e2a25a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA961 10780 bytes

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