Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d529c2f2cb8eb5…

MALICIOUS

PDF

46.6 KB Created: 2020-08-20 01:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea8e28c0b483c8d09f98737168377a8 SHA-1: 119f6c4cb3d3920c6fd53ee3531c5d0730213907 SHA-256: 66d529c2f2cb8eb562ae1d07087ad9a640b2485c420f123d3bf3713710f5c654
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.com/pify?keyword=yasuo+guide+s8+mid. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm or content-luring tactic. The presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent, likely for phishing or malware distribution.

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.com/pify?keyword=yasuo+guide+s8+mid
    • http://bunupo.lanternbm.com/uploads/1/3/0/8/130874629/0a380.pdf
    • http://files.flrvc.org/uploads/1/3/2/8/132814286/wulajazusekalab_gokiwefed_zamajijajelit_balatejux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/vamenaximuwoxowotubapev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6465/files/98566392127.pdf
    • https://cdn.shopify.com/s/files/1/0449/9944/2590/files/sweetbitter_stephanie_danler_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0446/7677/6089/files/achyut_godbole_marathi_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/ilmi_capsule_islamiat_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/budadavozabefoborosidat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/korokamuxisivisufemumumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/oxalate_content_of_foods_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/mechanics_of_materials_8th_edition_gere.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/23461286793.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/jasanoxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/atlas_v14_download_hongfire.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_off00006da1.bin
f77581f420e0a829584e3c0039eaaa307ecf249a8ecc676478a2336595f7af5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 5172 bytes
font_01_sfnt_off00007f27.bin
6dae974b742908d3076788c8e198edd561f0b595138fd5e8d989eeffa2b9af8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F27 14876 bytes

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