Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04645e93236e5c1…

MALICIOUS

PDF

45.2 KB Created: 2020-07-10 10:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d13afac4b72ca996892f2df6efd988 SHA-1: 0a51f375356a4f6a7cbc1db845778dac17206d25 SHA-256: c04645e93236e5c1326bf5d00c62220345787dfc5cbec392d45ce624c2625555
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, forming a link farm, and a primary link to a known malicious redirector. The document body, while heavily obfuscated, contains text related to a handbook and the malicious redirector URL. This suggests the document is designed to trick users into clicking links that lead to malicious infrastructure, likely for further exploitation or malware delivery.

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/wb?keyword=menezes%20handbook%20of%20applied%20cryptography%20pdf
    • http://files.champaignilapartments.com/uploads/1/3/0/9/130969046/jobebabudesuwin.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • http://files.umdgreeklife.com/uploads/1/3/1/0/131070912/divutarasibovunuguju.pdf
    • http://files.glendalegatewaytrust.org/uploads/1/3/1/3/131380138/36aad15f1.pdf
    • http://files.mariecharpentier.net/uploads/1/3/1/3/131382942/59ca15669ea12.pdf
    • http://files.uwyopedology.com/uploads/1/3/1/1/131163920/9df61201150.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://files.susanmacdougall.com/uploads/1/3/2/6/132695347/tiwuvobegiwawaz.pdf
    • http://files.dunmorens.com/uploads/1/3/1/8/131871727/8016814.pdf
    • http://files.okrarestaurantgroup.com/uploads/1/3/2/6/132681325/6262684.pdf
    • https://pitekule.files.wordpress.com/2020/06/25912079724.pdf
    • https://piviraxiwak.files.wordpress.com/2020/07/75451170142.pdf
    • https://lawikisuj.files.wordpress.com/2020/06/kunipezivitumomafozisa.pdf
    • https://gojinelidak.files.wordpress.com/2020/07/82340159754.pdf
    • https://rokefofa.files.wordpress.com/2020/07/girobakaj.pdf
    • https://vigazot.files.wordpress.com/2020/06/75971084422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000724d.bin
21e68f475afb1f388a03cec7a7ae3253a1c165b083aaaacbd77f2eb35a0c18e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724D 5568 bytes
font_01_sfnt_off00008541.bin
38182057563f7590ceadc61e8710c82044f2c30420ef0c86cc4d2adf2cd95958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8541 10016 bytes

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