Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3dfbe784bfa06f…

MALICIOUS

PDF

50.5 KB Created: 2020-08-17 18:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5ad9b3fef0a3679110bee254716fac SHA-1: d6cef545dc889fa4b1b39c85726c71468f15db8a SHA-256: 6b3dfbe784bfa06f219051f1109852e0b3b9e53e4640ab4e5d22830e6d5aac23
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://ttraff.com/pify?keyword=dbz+android+14+15', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated 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=dbz+android+14+15
    • http://files.arniebermudez.com/uploads/1/3/1/3/131379510/5cfea0d662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/47887698910.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/lavosixo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/philosophy_and_african_culture.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8373/files/cannot_download_album_from_photobucket.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/termidor_he_safety_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3417/3859/files/character_development_theory.pdf
    • https://cdn.shopify.com/s/files/1/0436/0873/5907/files/ignition_system_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/convert_dataframe_to_list.pdf
    • https://cdn.shopify.com/s/files/1/0443/2812/4572/files/pharmacology_for_anaesthesia_and_intensive_care.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/amylose_cardiaque.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/65761065032.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/gefijebazuvuditineka.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_off00007bae.bin
b62ce9c0d09c3cdbb48786fe51410bbb293440a5fc0c6d07eb455f6c53b70511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 3540 bytes
font_01_sfnt_off00008842.bin
1d4dac6de07138ab13a60e871cc5ebfb226a966e30754b3a19428f3a44884e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8842 5064 bytes
font_02_sfnt_off0000999a.bin
d7ee9238dc7885bb935cb329f66f0ff48b319a0f6014c19893b072c127cefa1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999A 10308 bytes

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