Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e3a14525024b3b…

MALICIOUS

PDF

53.0 KB Created: 2020-08-03 17:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d254ab36ec5433bce00e5cdb601a7159 SHA-1: 46b02f7db68cd2b5c5fccfa94e273f5c79a498d2 SHA-256: e3e3a14525024b3b0ea81f684b992909766a49f654cb8cbd6ac9761b22367c10
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=java+programming+language+full+tutorial+pdf'. Another critical heuristic indicates this PDF is part of a link farm, likely for SEO manipulation or to distribute malware. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=java+programming+language+full+tutorial+pdf
    • http://files.winesbymina.com/uploads/1/3/1/6/131607163/kubonu.pdf
    • http://files.umscorp.net/uploads/1/3/2/6/132695428/9757217.pdf
    • http://files.navy101.com/uploads/1/3/0/8/130814115/foragutagaj-buvusifi-jolonurudibirar.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/3112068692.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/35587542063.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7254/files/r_kelly_songs_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/mizafewakubepagufiripizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0361/7173/files/rokukoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/true_strike_cantrip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6721/files/40069746474.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/69981855083.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/mogojiralikanetimad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006144.bin
2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 6568 bytes
font_01_sfnt_off00007191.bin
787a1237fc11f857828ca9f2d570485fbc19ff033dd3c233861e414e2ee6f43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7191 5232 bytes
font_02_sfnt_off00008352.bin
f101fc3023143cbc24e87e2583c027b8b5ab7dfb9504abb66ff99af634bcdac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8352 1804 bytes
font_03_sfnt_off00008c2d.bin
48d8ad2063c7119dc61857773a08a7428f861440016f3375d3f8b4e26e28414d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2D 10760 bytes
font_04_sfnt_off0000b0ba.bin
64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 16148 bytes

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