Malicious PDF — malware analysis report

Static analysis result for SHA-256 17de5bd6d4aae34e…

MALICIOUS

PDF

42.0 KB Created: 2020-09-11 15:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ab1951683da59cc512714f0a992849 SHA-1: b6f24209049b8f70eeb6bdf78635b78ad35b5bb8 SHA-256: 17de5bd6d4aae34ec8dd75b8940ab2a6d8ba74d8b279883696524552878882f9
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wb?keyword=ctet%20syllabus%20paper%201%202019%20pdf, which is likely intended to lead the user to malicious content. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=ctet%20syllabus%20paper%201%202019%20pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e2c250_b37122cc9d184817a7c8e0745d16ecea.pdf
    • https://static.usrfiles.com/ugd/229b11_5d585ae8f0134dc2b8afbdc7cae4f6ab.pdf
    • https://static.usrfiles.com/ugd/81d6a4_e501ff2bdc034225bd3a462c6ac03966.pdf
    • https://static.usrfiles.com/ugd/ca300b_23417969babd465aadd24e1f8bd20c8d.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/relaxing_piano_solo_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4736/2453/files/91975584687.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/bump_bot_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/30705450957.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/youtube-_dl_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/80591805908.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/bizajofavisirevew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/notorious_big_hypnotize_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/80550853134.pdf
    • https://static.usrfiles.com/ugd/934fc3_c3284046d9b440108a8417b84c895e5f.pdf
    • https://static.usrfiles.com/ugd/b42fd6_27522dbed76e4864a7f56369d7444c1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcf35407fab42aab17ac4e20d9a7c69.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_off0000666e.bin
c23ac7883b81e2743a081965371383f3b203d18d27ed55364e1175b114eb6272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 5664 bytes
font_01_sfnt_off000079c0.bin
0341af2922515a72503253ea935be5dde059f02870828768686df26b030d99f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C0 9860 bytes

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