Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da6ea720de63a3d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd6455e156b3a68c22e2d7378446ae2 SHA-1: 4d53f0235600a89f28a7a18f91ed314763798c3d SHA-256: 6da6ea720de63a3d1ae0b619f92db18867f11726d0b3e1397a4dc33975727bab
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier also flagged this PDF as malicious, increasing confidence in its 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=alfabeto+e+numeros+em+ingles+pdf
    • http://giwado.erinsmithlac.com/uploads/1/3/2/8/132814930/610126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/jilep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/34277294661.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/osrs_spiked_boots.pdf
    • https://cdn.shopify.com/s/files/1/0447/0036/9049/files/kirebode.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/deaf_like_me.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/24496691712.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/dimimoforim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/bosch_aquastop_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4881/0149/files/42153481521.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/anlage_kind_2020_ausfllbar.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_off00005983.bin
5d18dc490c0033399fc6de7ae8ca0f149bc13cd53f31ee773fedfd8f0dbd032f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5983 5492 bytes
font_01_sfnt_off00006c15.bin
029206bdd709b6e01200ba92a4aef07ec4b492c75bb553dc64effbe43b77822d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 10148 bytes

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