Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8457ea6b7c5fd5b…

MALICIOUS

PDF

54.3 KB Created: 2020-08-29 15:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7a63fd625de6e472991b5c02ce0304 SHA-1: 3c40e43f1522afbf6cceb9ff8304abd99b593aa1 SHA-256: e8457ea6b7c5fd5bbd9c9921226790b4a442d6b5f7d2ecc2c9992b2788dc7bc7
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that lead to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Napoleon hill libros pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further indicates a link farm designed to distribute malicious content.

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/wix?keyword=napoleon+hill+libros+pdf
    • https://static.usrfiles.com/ugd/b8c837_375a05807ce04b289c25bb17c0fdcfbd.pdf
    • https://static.usrfiles.com/ugd/576447_03d852da200940ceb58fe4fc980d79f6.pdf
    • https://static.usrfiles.com/ugd/a91264_0504e27fe58b48f6bd1c506a2a23b829.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a9ae132204e4e5d83e4038aca1f278f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9aededc51e8842e38f48124ca1d670d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e261fc6a85604b87890c33fb52107b63.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bb78c9e5d064837b2103118abe422fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d50a6f3fbc174090b007423b66107f7a.pdf
    • https://cdn.shopify.com/s/files/1/0437/2581/5959/files/fokel.pdf
    • https://cdn.shopify.com/s/files/1/0459/0452/7514/files/abc_kid_tv_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/kulidudonemijafoto.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/nerapowazu.pdf
    • https://static.usrfiles.com/ugd/b8c837_4599b1e1f34d4d9885625c493d52c647.pdf
    • https://static.usrfiles.com/ugd/b8c837_12d28cc9014b4fe08ada797c88549342.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc22890e19354a8c95a814f9dc2f3ac0.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_off000096a0.bin
8852c9c9c421754dc8f56e35d884ff95ae21959ff71dad80c5f2dda5d2198ca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x96A0 5236 bytes
font_01_sfnt_off0000a858.bin
4cecde68f00b1b88a97fe5f73f1576435117f06fe0b37d6f102ac96ec5d2d3f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA858 11004 bytes