Malicious PDF — malware analysis report

Static analysis result for SHA-256 7827ddd8040618ec…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 21:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 602017ead92c668697c13e6bd96a0eb7 SHA-1: db268e36a8524503a16b187f6da731085e07538e SHA-256: 7827ddd8040618eccb8a530eb6cb77beb03a8d7575e8cbefd8f85179557f8464
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 a link farm designed to improve search engine rankings. One of these links, https://ttraff.cc/wix?keyword=ejercicios+resueltos+de+adverbios+de+frecuencia+en+ingles, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=ejercicios+resueltos+de+adverbios+de+frecuencia+en+ingles
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b916f4_959922b0218046c3a3c6b3182ff62f01.pdf
    • https://static.usrfiles.com/ugd/83f04e_eb569306bd7c4e65b9d00464ef23925d.pdf
    • https://static.usrfiles.com/ugd/67e251_116018f96f5c4972925d5d45fb8d6934.pdf
    • https://static.usrfiles.com/ugd/d3758e_e1f946b627114b4b9a12955ca410b209.pdf
    • https://static.usrfiles.com/ugd/57c819_7f273a4e56c64905bd522889f77b8534.pdf
    • https://static.usrfiles.com/ugd/accd1f_6d7c4be0100948a1a0110b4d76254297.pdf
    • https://static.usrfiles.com/ugd/b3bc21_cbad527e35af411a96e020febcc50f6e.pdf
    • https://static.usrfiles.com/ugd/97368a_297f37534b4a4262b12249dd5c46b546.pdf
    • https://static.usrfiles.com/ugd/353d00_1184a9e7989f46bcb798312f21ab1415.pdf
    • https://static.usrfiles.com/ugd/b8c837_13f261257c5043a58472f0bb93139fd5.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/worksheets_for_kindergarten_math.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/autogenic_and_allogenic_succession.pdf
    • https://static.usrfiles.com/ugd/b7ed05_9e3f5fb372644b899a85220584bde133.pdf
    • https://static.usrfiles.com/ugd/b91566_728d5af0951f436cbb9c17532aad78cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b01fc56c381f4779bf5c7aad3101d6d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cfa656bb47247d894b66cbc9449a514.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_off00005f82.bin
3a004d8b3d27713956d8d1f75866ecfcc08da16e14bd665582031bbe882eb5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F82 5420 bytes
font_01_sfnt_off0000720a.bin
a1bbf89d182dfb59c358c765ac8e86bf3ce5b66391f7d74566cca96a3896c4c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 15676 bytes

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