Malicious PDF — malware analysis report

Static analysis result for SHA-256 6244c679fe0a932d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-03 18:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b41a386a76206a7e546bbd36360e091 SHA-1: b699f46ea9aa8d5e096af5816edb83b76027432f SHA-256: 6244c679fe0a932dc2823ccf215635775514db5dc4a51357acc6949c505d2dae
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as academic content. The ML classifier strongly indicates maliciousness. The embedded link 'https://ttraff.ru/wb?keyword=reciprocal%20trigonometric%20functions%20worksheet%20answers' is the primary IOC, likely leading to a further stage of infection.

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/wb?keyword=reciprocal%20trigonometric%20functions%20worksheet%20answers
    • http://files.skipcoryell.com/uploads/1/3/0/9/130969498/levezu-fisuzevopo-kufagaxisulojo.pdf
    • http://files.adidulza.com/uploads/1/3/2/6/132695257/9113320.pdf
    • http://files.gtcwomen.com/uploads/1/3/1/4/131453917/pibof.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/23727967444.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/80502190156.pdf
    • https://cdn.shopify.com/s/files/1/0434/5164/6119/files/discord_syntax_codes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/dorejuzujinazevijaxef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/45662004185.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/roxopomukopiga.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/minecraft_xbox_360_parkour_seeds.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/10755510187.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/30122708905.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.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_off00004faf.bin
ca460df6ebc41b5f142c2ef0dcb21ca8272a6fbd7d004fa3c2e4c25d41f43b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAF 1968 bytes
font_01_sfnt_off00005868.bin
1ad1a40ba6f46aa1cd3a21bbe761a6c43ea61ab53cfdfd1809f2e99b93facf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5868 5592 bytes
font_02_sfnt_off00006b60.bin
10f7b1cce844452ff9f37e23fd3ae1c743319d06b2556eeb4d3c53bdbbe4d8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B60 9956 bytes

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