Malicious PDF — malware analysis report

Static analysis result for SHA-256 08af81c5b8af0ba0…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 17:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ea7064af7b5c2d501fc175580933a6d SHA-1: 16beda0e5356aea48c473c798bf0cb15b4f6ae28 SHA-256: 08af81c5b8af0ba0eb55e781a78005e1ee54e3ed84768adb72cc44bebdbe9615
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms designed to manipulate search engine rankings. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though partially garbled, contains text related to a test PDF, reinforcing the lure.

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=ameryka+p%25C3%25B3%25C5%2582nocna+i+po%25C5%2582udniowa+sprawdzian+pdf
    • http://files.icerandw.com/uploads/1/3/0/7/130739895/4f73fc9f8.pdf
    • http://vaguvuwim.lapen.us/uploads/1/3/0/9/130969723/fd8a78ea43e4.pdf
    • http://files.cecilapartments.com/uploads/1/3/0/7/130775498/xotajuwugof-kunimo-miduwuriji-latud.pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/kodulekopuro.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/network_administrator_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/1199650328.pdf
    • https://cdn.shopify.com/s/files/1/0439/4090/5128/files/animals_coloring_page.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/lurufarowoved.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/84147657180.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/belmont_report_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/sijajuzodelagevogunejof.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/sawalokowitoziri.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/10521376102.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/dubimawajowidisavukabode.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_off00004e06.bin
8f411f5c375267b18f381495079173eb2b670c1d69c7864811ef4188791138ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E06 5560 bytes
font_01_sfnt_off000060b5.bin
79380e95ab84ad1cf1f5a2eb9702fe749ff3940a5fe309600bf7cc8793c4c667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 11108 bytes
font_02_sfnt_off0000839c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x839C 4324 bytes

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