Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852c7eca34934fa…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 23:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4873b850e3edef9aed4761ef4b9dfb SHA-1: 94b8f369bae067bcc87a17da90701d76eb1a6a5e SHA-256: 7852c7eca34934fa14f0bc968c3c37d593def65a89af5f0ebb7f9b696219d39b
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 generate search engine traffic. One of these links, https://ttraff.me/wix?keyword=math+worksheets+grade+3+place+value, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain similar URLs, suggesting an attempt to trick users into visiting malicious infrastructure. 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.me/wix?keyword=math+worksheets+grade+3+place+value
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/353d00_5d14b34282624ac3b5f2612648e80b40.pdf
    • https://static.usrfiles.com/ugd/96768c_8149f0a387434750b3bede56856b7141.pdf
    • https://static.usrfiles.com/ugd/5438e3_cc8e7fb1e690448282478914406dd463.pdf
    • https://static.usrfiles.com/ugd/529dbf_82aa87608a114500be5ccce0874b591f.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/21108791479.pdf
    • https://cdn.shopify.com/s/files/1/0438/0029/7633/files/how_to_host_server_on_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/kofabizorudoju.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/fanasimeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/showbox_install_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/recommendation_letter_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/python_coding_best_practices.pdf
    • https://static.usrfiles.com/ugd/83b1b3_06415bb01a764099bba5d475ac987bdd.pdf
    • https://static.usrfiles.com/ugd/bfbc46_f057008fec5b4127978adcf32dffc955.pdf
    • https://static.usrfiles.com/ugd/b4a829_b721328b62b74da3be45afa8c1fc2ff4.pdf
    • https://static.usrfiles.com/ugd/299074_ffe7460aab4041679d188872e7064561.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_off0000639e.bin
62c886f17d004544d2b16488d21d022de470b779349001f285da3daaef4e6dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639E 5720 bytes
font_01_sfnt_off0000773e.bin
39ddcd68e1df3aa0cd7e187bed59657a195a0d91ed4452bbd165d1a47eebf6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773E 10616 bytes

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