Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9e96841f4593a2…

MALICIOUS

PDF

67.2 KB Created: 2020-08-31 05:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da35ca5b6112c5a4fb815db3194d0144 SHA-1: 7a7212f5f137b255981d14caad7e9d39af411aac SHA-256: cd9e96841f4593a2901bcea2e3a011d4b1e238db01ef72c9a52231f21f95690b
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/wix?keyword=acls+book+2017+pdf+free', indicating a lure for users to click the link. The PDF_SEO_LINK_FARM heuristic suggests this is part of a larger campaign to generate traffic through numerous linked PDFs.

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.cc/wix?keyword=acls+book+2017+pdf+free
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/65031791446.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/holy_grail_osrs_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/form_mv-_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/foxefew.pdf
    • https://static.usrfiles.com/ugd/b8c837_a917695fcc12412e834d052dc22b206c.pdf
    • https://static.usrfiles.com/ugd/cfa91a_62cfe244a5a3485d9f948b29bec20a9d.pdf
    • https://static.usrfiles.com/ugd/76de1a_8ded74143fe04d9eae31759e2cc580ae.pdf
    • https://static.usrfiles.com/ugd/217d68_84a227e2941d4d1887edac8b31764e5e.pdf
    • https://static.usrfiles.com/ugd/60933b_b0a5aa2571844b06af3ee7a88e1b31e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc2a8d158dd94335a705d6c1246d6646.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_off0000c83d.bin
f783216bc36ba61ba23c7417577dbbc132178ca4fe119607af90c20ba2852167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 5536 bytes
font_01_sfnt_off0000db27.bin
bdd4852bde60abe0aadb761819b030e8ef4cf90667bf1a1d1fea6003c7393cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 11300 bytes

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