Malicious PDF — malware analysis report

Static analysis result for SHA-256 114da4454815d74b…

MALICIOUS

PDF

50.7 KB Created: 2020-08-17 12:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d55590026ee3726df6aadc0803c33e8 SHA-1: 2be2b3f8edb8a46f44f4be0c730e62104a00eb93 SHA-256: 114da4454815d74b3eea96f1b09c392d85f2bb5bd0c4493a8ce8c3193a738732
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains references to "Windows 10 gratis nederlands 2019" and URLs that likely serve as lures for downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL reinforces the malicious intent.

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.ru/pify?keyword=windows+10++gratis+nederlands+2019
    • http://files.lastfrontiermusic.com/uploads/1/3/1/4/131437385/kigimarubobu.pdf
    • http://files.landstarcontracting.com/uploads/1/3/0/7/130776246/4879136.pdf
    • http://files.dollartank.net/uploads/1/3/0/7/130775974/9761352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/75667601128.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/sitere.pdf
    • https://cdn.shopify.com/s/files/1/0435/5420/9943/files/1073894850.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/college_physics_knight_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/analytic_geometry_in_two_and_three_dimensions_chapter_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/71407204581.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/60143982686.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/28769912571.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/23964765682.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/binary_tree_cpp_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/talavekedukewafeluxipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/sexy_girl_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/86681836213.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/79159237073.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008716.bin
6d908defd88e4d03ce9314e642e279d28f213134fba9d6a9796d559c09bfa91b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8716 5580 bytes
font_01_sfnt_off00009a33.bin
d03d99efe31a1bad123de6e34ae38d3bff8053a4e0774a6fbd4621f1486e9dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A33 10468 bytes

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