Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d53663d9a8bc940…

MALICIOUS

PDF

48.2 KB Created: 2020-09-17 06:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ae3010c8293b5f7597b3c74bf8b438 SHA-1: 6d71966ec66c34fefb5c2172d6bb2a4194b3f416 SHA-256: 7d53663d9a8bc9409595204120fa97898d1ece0802ae25a7dc8aad8ad9bd8be7
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious redirectors. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.link/wix?keyword=spillover+book+pdf
    • http://files.katrina-wilhelm.com/uploads/1/3/1/8/131856433/cfbf1ccf7d06a.pdf
    • http://jupar.sheltercraft.org/uploads/1/3/0/8/130874370/d40cd1107.pdf
    • http://files.betsyleebaileymusic.com/uploads/1/3/2/7/132740564/kimamixorofitu-mizuziximexaxe-gikagurafe-zadawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/formule_du_bicarbonate_de_sodium.pdf
    • https://9bb6805f-b413-4364-9898-f7e1bb52b13f.filesusr.com/ugd/d9d1f5_dc616396b27f423e824ae013dfbb45c0.pdf?index=true
    • https://7dd48d21-ca83-40c3-93a1-d2577063a49a.filesusr.com/ugd/696117_8a6db8904cb5489aba11f4dfceea07f5.pdf?index=true
    • https://884d7d92-59ee-4437-a07f-a661e2a340d9.filesusr.com/ugd/ac8c68_02f9a8db71b34858a66849894f7b514c.pdf?index=true
    • https://82e333bf-5691-4ce0-ad3a-a7a69fba4932.filesusr.com/ugd/ea2c45_51a21c91317f4c4c9e1ca322f3e11a2a.pdf?index=true
    • https://a4a54cbb-2f5f-440d-8ffa-3ca8efdb7921.filesusr.com/ugd/74e905_83314a8684cb493da5f3de9aaa2c7efa.pdf?index=true
    • https://258e301a-a2e9-4e17-9496-8c285e353043.filesusr.com/ugd/d2759c_499cfc971e44406395c29a504b6c009f.pdf?index=true
    • https://c08d0873-075e-47f0-be16-138d9f73c2b7.filesusr.com/ugd/9ea91e_b23c67fe0c36472ba4ce79a19b94b5f0.pdf?index=true
    • https://8df680d6-6a63-4d92-b94d-515bf3c68676.filesusr.com/ugd/08338c_0b6c0ba4adbb479c856613a9c04c2aa0.pdf?index=true
    • https://aa862a48-1835-4974-9e15-67d950a265eb.filesusr.com/ugd/ab5adf_9adfff69f6594f948532f497810f0f66.pdf?index=true
    • 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_off00008083.bin
ef4af70b1729aa461184da02d0591dfe1b8ee18ab51505828238062111ee778f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 5016 bytes
font_01_sfnt_off000091a9.bin
0892cd86d6f7dda54c58e4d18bafe56a2bb2d35e367ce1722e92adb0587080f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A9 10236 bytes

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