Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe3998b243cc25d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 01:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c54460d7bd4a4728729cfe04b7abd4 SHA-1: 108f4012dc2bac8c104c4e5963b7c639591c79a6 SHA-256: 0fe3998b243cc25d7a5975a42966ae1cf482c0daf41d4826f87c16e259d80a31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to known malicious infrastructure. Another critical heuristic identified it as a PDF link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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.ru/wix?keyword=gba+minish+cap
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/ruseruvovapagifulaligiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3403/files/48051573779.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/riwus.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/piluxaxejapevumiludaxo.pdf
    • https://static.usrfiles.com/ugd/834936_e6a3aebc988d436eb7a736b645d9f7da.pdf
    • https://static.usrfiles.com/ugd/b8c837_65e00add5f7e4f819b732a07367ea238.pdf
    • https://static.usrfiles.com/ugd/b8c837_2556911f02764007aacff729e7e70393.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/nozodotegapekuwuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/ty_beanie_babies_pricing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5795/5494/files/73912560205.pdf
    • https://static.usrfiles.com/ugd/b8c837_350ed67898fa49bc8ca490459bc7a8c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4d71394db514285b0e877aaeb746780.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_off0000455a.bin
4eb02bfcf3aed7ec4e4758a825c7e977b1b5c284ee6c77e7c55ae7c2838671cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x455A 5380 bytes
font_01_sfnt_off00005808.bin
f5ba7ef5d22a76a8dc2cdd0ec5d8a38f5f5b2dbae1c6943be4670cc5f67e38cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5808 5216 bytes
font_02_sfnt_off0000699b.bin
bbc48410a9dfcca448460d0ad0ffeee4f88a8ef5d701339b3f51c4994325043e
pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 13576 bytes