Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1630679c282ac8…

MALICIOUS

PDF

130.1 KB Created: 2020-08-20 11:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8469368a50d8df1b6e420b591f79063 SHA-1: 2b55e5ee5bad409ed2f8920205f5505fa3299f22 SHA-256: 4c1630679c282ac86f34458eb967088bedc57ecfde15a45187d250e2e7dfe9b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous external links, as flagged by PDF_SEO_LINK_FARM. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=accounting+principles+thirteenth+edition+answers
    • http://dumipufo.pyuschan.com/uploads/1/3/0/8/130874218/radetikumidifuvalej.pdf
    • http://nugasiga.taunyapage.com/uploads/1/3/1/6/131606727/zirurafiruxake.pdf
    • http://files.bobgamblephotography.com/uploads/1/3/0/9/130969607/sawovipemu.pdf
    • http://vegopokal.freedive305.com/uploads/1/3/0/7/130776486/62190f540bc5a3c.pdf
    • http://files.katherinedaugaardart.com/uploads/1/3/1/8/131872105/9a3deb67.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/4508723154.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/47936953148.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/62215595136.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/arab_emirates_airline_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/sosugiledezarogidikinov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/mapudanini.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/fodagupimupukikumerus.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/5743706401.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/daz_loader_windows_10.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a023.bin
28e9656e2d92d88c633582daa57f487f48e1d02e601edb47388c49513c0fc04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A023 1940 bytes
font_01_sfnt_off0001a943.bin
4c0a62ad665011d6943554854215912815a96ab5b6b764ba924ce2edfe4c97c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A943 5296 bytes
font_02_sfnt_off0001bb44.bin
9b582d5e300bf631bc2d2c38689724abfb5ee80ba7e3d86796bcf72fb53ef892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB44 15888 bytes
font_03_sfnt_off0001ec9f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC9F 4324 bytes

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