Malicious PDF — malware analysis report

Static analysis result for SHA-256 76caf45f0a0fe4cf…

MALICIOUS

PDF

51.2 KB Created: 2020-08-28 06:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b757ab0502a1b05a9793ec968be503af SHA-1: 9050833b34d1a8e383b902a2267134631a14d2e8 SHA-256: 76caf45f0a0fe4cf257c73885ef757d96a628da13146488a6431346266398527
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a deceptive lure related to "Spongebob scaredy pants full episode" and embeds a large number of links, many pointing to external PDF files. One of these links directs to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to distribute harmful 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.cc/pify?keyword=spongebob+scaredy+pants+full+episode
    • http://furow.orillialawnbowls.ca/uploads/1/3/1/3/131380183/5616965.pdf
    • http://bizuvab.katasangkhae.com/uploads/1/3/1/8/131856005/xipajitekijiw.pdf
    • http://files.distinctiveautomotivesales.com/uploads/1/3/2/6/132696111/bedovob.pdf
    • http://kiguxog.judydeal.com/uploads/1/3/2/7/132712109/nuzexisotokura.pdf
    • http://koxejade.coloursfresh.co.uk/uploads/1/3/1/8/131872225/guxemep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/i_40_accident_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/xujijit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/physiology_practical_book_ak_jain.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/46501985209.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/51313897488.pdf
    • https://cdn.shopify.com/s/files/1/0434/3798/1852/files/91025842098.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/54992567650.pdf
    • https://cdn.shopify.com/s/files/1/0461/9209/9477/files/10498612882.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/53143202430.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/rogosutovinezagogamu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000655d.bin
8b0dbecafa5ac27ccb663bc2fe9f516e42712e564bb3b5dbd445872f04dc5b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 5552 bytes
font_01_sfnt_off0000783c.bin
e5d8fa588fd4e1638aa3ba39ed7194831577b92dacbf046cf92a7beb9c32ad58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 10440 bytes
font_02_sfnt_off00009c3c.bin
1871dc7543e5fa9fd41f60a4858ce46ecd1ad89bb17f9a152d343f7cd3467385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3C 16064 bytes
font_03_sfnt_off0000b0c7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C7 4324 bytes

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