Malicious PDF — malware analysis report

Static analysis result for SHA-256 1663de34728d7579…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 06:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f7f0c8a36af1df9f67943251ee70670 SHA-1: 5fe813c04dccbfc4aed2192ffc878856c14c0dfc SHA-256: 1663de34728d7579c19d6fcc3893d58b4606112d9c22c697a093b92d7b69da51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, while heavily obfuscated, contains references to the redirector URL and other potentially benign-looking PDF links, likely as part of a link farm to improve SEO and disguise malicious intent. The ML classifier strongly indicates maliciousness.

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=butter+chicken+recipe+in+malayalam+pdf
    • http://sitowel.gbtransplantcycling.com/uploads/1/3/2/6/132682076/vowupuw.pdf
    • http://files.104brilliant.com/uploads/1/3/0/9/130969645/4666279.pdf
    • http://files.southshoredanceacademy.com/uploads/1/3/0/7/130740391/netevefumaxez.pdf
    • http://files.ulcel.org/uploads/1/3/1/4/131483386/5441442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/38248544755.pdf
    • https://cdn.shopify.com/s/files/1/0433/7198/7098/files/minecraft_server_pe_hunger_games.pdf
    • https://cdn.shopify.com/s/files/1/0438/4741/8016/files/anglo_american_literature_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/razos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/22950977518.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/the_idea_of_the_world_bernardo_kastrup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3625/files/28146684335.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/32527754718.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/xonifuvojub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9925/9031/files/12901219995.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/bunog.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_off000062c7.bin
f2c09893f5b13cde8367f1a6cc5e4ac69e5ff031f52f59b10bdaf1a7629f8bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5204 bytes
font_01_sfnt_off00007452.bin
c407b22887cdf2fa99cf61fe93fbbe202c962f7b0d6d476dd0be144116ffaae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 10080 bytes
font_02_sfnt_off000096bf.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96BF 4324 bytes

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