Malicious PDF — malware analysis report

Static analysis result for SHA-256 729e77c5fdfbfd05…

MALICIOUS

PDF

61.9 KB Created: 2020-08-16 02:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e938584fb13a6752b0d38902f17d18fd SHA-1: 17752fa85e6681ada47fbb0cf343488e9072bad7 SHA-256: 729e77c5fdfbfd052efe09ebdb27ff6c75505599e54c1dfb0fc5d91d38d0eabf
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.cc/wb?keyword=citizenship%20in%20the%20world%20merit%20badge%20worksheet%202017, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating 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/wb?keyword=citizenship%20in%20the%20world%20merit%20badge%20worksheet%202017
    • http://files.ridgemontresources.com/uploads/1/3/0/8/130813132/wumut_dovuxunowogari_lajatekur.pdf
    • http://files.anglemidwest.com/uploads/1/3/1/3/131381109/6695135.pdf
    • http://kajukurop.wendijjensen.com/uploads/1/3/0/7/130739046/niputedijegawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/zuputojijugoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/chemistry_notes_for_class_9_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/ralijujikolekujosogudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/79896707105.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/deguwazulim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/dizozalawademegew.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/gedidolifogowusomawab.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/96927565894.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/girorowe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1ed.bin
22720be28c7171d837f88886eebd708548c42ec4cce137785f2595934d4108d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1ED 5936 bytes
font_01_sfnt_off0000b612.bin
eaa8f72101b6addd51249fb16f47b7e403b9b8c52320a765e477fca528abbca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB612 11352 bytes
font_02_sfnt_off0000dcab.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 4324 bytes

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