Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a1961c47c9c107…

MALICIOUS

PDF

68.8 KB Created: 2020-08-06 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b82f8b6337bee451aad744db0bd54ae SHA-1: 403d1534f6d034a322c64349090426496a844b1e SHA-256: c4a1961c47c9c1071f3bc5cca89d8f0534ff0215c6e4c788d08ddfc65a3a7821
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Delegation in nursing management pdf' and a URL that matches the malicious redirector. This suggests the document is designed to trick users into clicking the link, leading them to a malicious site for further exploitation. 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.com/pify?keyword=delegation+in+nursing+management+pdf
    • http://fepamogiw.branfordbecc.org/uploads/1/3/0/8/130814017/961c067bcec.pdf
    • http://naxenil.lakeviewtherapygroup.com/uploads/1/3/1/4/131482976/wenavuxoxila-xevevewexonef-jexiwakuzokufib.pdf
    • http://files.missionlenders.net/uploads/1/3/0/8/130874511/2441119.pdf
    • http://files.reluctant-traveller.co.uk/uploads/1/3/1/4/131407361/jitololudoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/31544174390.pdf
    • https://cdn.shopify.com/s/files/1/0432/6460/6372/files/ftk_imager_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/dikexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/60901712916.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/responselink._xerox-_rs._com.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/vuzinezetuwaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7001/4111/files/gosudorajanugeliv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/tobijidimupikozewugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/2628518449.pdf
    • https://cdn.shopify.com/s/files/1/0429/4069/4684/files/gungeon_gnawed_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/27968082098.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/angular_js_session.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/81063920696.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_off0000d056.bin
8d1b760b43e0e9d7c61f6954644063df4f728bcf8dc2363fcef95f6e1e91c06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5360 bytes
font_01_sfnt_off0000e284.bin
b91155c9ad74d2e8df56fd236c525b3f3e2635cd583f074696a1c3ad69f4a9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10304 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.