Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3872fcc914cfba…

MALICIOUS

PDF

46.3 KB Created: 2020-08-18 20:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1300f06b52056624b6e68f525047c65d SHA-1: 20e317c087bc72c17e723219726901a1157eb84d SHA-256: 5b3872fcc914cfba176792ed707bf5968aa15f5d1702ca8f91a76f68abbb9071
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier also strongly indicated maliciousness.

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=maglev+wind+turbine+with+ppt+seminar+report
    • http://files.mohamedlahna.com/uploads/1/3/1/1/131164157/76d21d4124.pdf
    • http://files.pennybrumbaugh.info/uploads/1/3/1/3/131398109/ruzoloja.pdf
    • http://tegane.mountedup.com/uploads/1/3/1/8/131856408/bojijelulaxit-lusuveg-rimexef-vadugorow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/duzorox.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/bogupasosopolejobulefok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/87866624895.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/2640889811.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/wixobazigosukalajupuwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tepuzapuzoxebigelif.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/minecraft_server_icon_64x64.pdf
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/xulotufizanukuno.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/monebufebogaxazajonikabaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/99407449454.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/56648957042.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/advaita_vedanta_in_kannada.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
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fa.bin
612e8e62305888537e7f1d4f1b6d09a0f148d6843cc53dd675d868eada2b326a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 5672 bytes
font_01_sfnt_off00007821.bin
d359ee11004b2dc2847c72adf873b8f8e972d925feae325a26f7561d125da79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7821 8912 bytes
font_02_sfnt_off000089a6.bin
64d0bca00fc2461fc5c644a3c7549de86cc9ba7f5c3d0b4503717fcbf08d251f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A6 10072 bytes

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