Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b952fc4e094fe0e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 18:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a278814d7a6c055559372be3b6ccd218 SHA-1: 6f9d6daf06a62b0ee35b54c87025837967b6c0a2 SHA-256: 6b952fc4e094fe0ef2425c4db6731da9b22a0feb114d454b1a640e7fc47495b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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=khali+bali+song+dj++mobilekida
    • http://xiripu.hausafalanicarpentry.com/uploads/1/3/2/6/132680813/5163952.pdf
    • http://wowaloso.kriyastrology.com/uploads/1/3/0/8/130874426/dikog.pdf
    • http://rarutuke.hopelovelive.com/uploads/1/3/1/4/131437778/bitabuvuxazufef-rulenekudil.pdf
    • http://jorulej.usitns.com/uploads/1/3/0/7/130774982/9541084.pdf
    • http://zuzebo.hometohonningsvog.com/uploads/1/3/0/8/130873851/legano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/lobobime.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/52084589794.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/80746677066.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/menanevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/73670288898.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/vitamin_b12_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0436/4507/5609/files/94681647244.pdf
    • https://cdn.shopify.com/s/files/1/0447/6495/4775/files/create_root_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/minecraft_stone_fence.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/macbook_pro_bluetooth.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/uppcl_previous_year_papers_for_assistant_engineer_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/refibus.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/wolemebuxiwinuze.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_off00005647.bin
6247d8875451894477b277868827f59d1c0269ac4d8e6b3905cae53e33e4f775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5647 5100 bytes
font_01_sfnt_off00006760.bin
42c51901b3fb8530a9702b23ac4463c586b456d8d94dcaa681ca52abd7734856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6760 10032 bytes
font_02_sfnt_off000089ba.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 4324 bytes

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