Malicious PDF — malware analysis report

Static analysis result for SHA-256 18911976a22fbde1…

MALICIOUS

PDF

45.2 KB Created: 2020-08-07 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0adb64c46f320b5ccc1b3b8bf6dc64f2 SHA-1: 2607c59c501e6b467116ccc584eab56997ee973a SHA-256: 18911976a22fbde133cf4c8b5e499d322c0cf3546353e4fa72f2e3d28ed64609
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 of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.ru/pify?keyword=analogias+ejercicios+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to lure users to malicious infrastructure.

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=analogias+ejercicios+pdf
    • http://bojilikub.connextionsmagazine.com/uploads/1/3/0/7/130776433/rovevomukazo-zopixu-mepewaxaxise.pdf
    • http://files.themagnoliatrunk.com/uploads/1/3/1/8/131871786/895019.pdf
    • http://files.backstagenb.com/uploads/1/3/0/8/130814535/6225992.pdf
    • http://sagofifa.paulschocolates.com/uploads/1/3/0/7/130739385/wepekaletinita.pdf
    • http://kuzataku.spartanac.org/uploads/1/3/2/3/132302780/dasikevetomeran.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/bunonugoxagotutan.pdf
    • https://cdn.shopify.com/s/files/1/0437/0166/5960/files/amadeus_peter_shaffer.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/jijarevemad.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/blockchain_revolution_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/7770/1533/files/ccna_routing_and_switching_200_125.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/10490965083.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/minoxipurabunud.pdf
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/81591895310.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/gebawavopepib.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/86567128822.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/34709503850.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_off000071ea.bin
627c928496b318c2076f4880aecae49b0bcc076fed4d53507499f16f6a402b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EA 5388 bytes
font_01_sfnt_off00008457.bin
89ae3f31bd0e03e25b6a7b6e210f2a7f76b06c966a4260d5fbb6c9aea4e7732b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8457 11044 bytes

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