Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd5626de25a6ec0…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 20:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53df5b4e9e53b82d0e6465b9b57e593d SHA-1: 33e8b14ed763a052b85786d89e8a122981ba0f08 SHA-256: 0fd5626de25a6ec09f1133a20487db15e51c6ae10abd4e7a915c07b2fc604f62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of numerous links, many pointing to PDF files with generated-looking names, suggests a link farm or SEO manipulation tactic to distribute malicious content. 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.me/wix?keyword=sega+cd+usa+bios
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_75ab08b098444edba480403e2c7413b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a7e07516dd45019b2af0ae4b07613c.pdf
    • https://static.usrfiles.com/ugd/760101_fbf1630333c341a5a1a432d4e40c05cc.pdf
    • https://cdn.shopify.com/s/files/1/0440/7178/0504/files/polish_company_information.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/jedukapoweku.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/fosowenexa.pdf
    • https://static.usrfiles.com/ugd/b8c837_06e553633be34dd69e42749317fc52fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3adabb3da63441b94fc10baf91845ec.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/lenovo_flex_11_specs.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4549/files/mutidipubilimoguzewuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/29284301613.pdf
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/brookstone_usb_missile_launcher_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/xumaki.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004de7.bin
dcd6a3161918f63799bb82ca766c619885836491bb3c89c218493996a5cf8882
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE7 4916 bytes
font_01_sfnt_off00005e8e.bin
bd91b78d94dc44c67f08b020fe371901f9e6bb852790e56999b67ff11a020621
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8E 14116 bytes
font_02_sfnt_off00008afc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 4324 bytes