Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b1ed11663927a0…

MALICIOUS

PDF

51.0 KB Created: 2020-08-06 00:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d03077c1221587876f08cfae84ea116 SHA-1: df00a9ba81f5a390320f28f873452440b20696c4 SHA-256: 88b1ed11663927a0b0f53985c5908292f49bba1669c933785a2126f0c395f16d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to PDF files hosted on various domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=aula+de+violao+completa+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to lure 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.cc/pify?keyword=aula+de+violao+completa+pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.coastaldanceclub.co.uk/uploads/1/3/0/7/130776374/kotululemuxa_lasaduredi.pdf
    • http://files.redroselandscaping.com/uploads/1/3/1/3/131380008/6890b4e73c6465c.pdf
    • http://files.easyway-it.com/uploads/1/3/2/7/132710732/jufobefovo_faguripuretax_nakizumam.pdf
    • http://files.graphicsetc-ms.com/uploads/1/3/2/7/132740798/lidosuwazuvego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/ravpower_rp-_wd01_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/21497585934.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/43244766522.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/88377781326.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/katopopasojuwuwizudin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7475/files/99_mining_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/topology_optimization_theory_methods_and_applications.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071f7.bin
6ddb08a8d2393f71a416f4c35961777254351a8ea5af27873c7c9b1f44520039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F7 5076 bytes
font_01_sfnt_off0000833d.bin
eaec0c72fb8cf5051f96b6b3353743e1327e746b32656ffc1aff6b9ccfdbd33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833D 11544 bytes
font_02_sfnt_off0000a930.bin
8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA930 16304 bytes

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