Malicious PDF — malware analysis report

Static analysis result for SHA-256 7172a9bd25a70041…

MALICIOUS

PDF

46.5 KB Created: 2020-09-09 23:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84d8df8112439f0a58321c3199933de3 SHA-1: 8e95d53fbba794768cded3e1fde09f252d447c94 SHA-256: 7172a9bd25a700419a1574d4dac38ca2069505288782ab9dbcd235abd66df944
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'SE_MFA_LURE' suggests the content is designed to trick users into providing sensitive information, such as MFA codes. The presence of numerous links also indicates a link farm, likely for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.club/wix?keyword=good+platform+games+2018
    • http://files.limerickcommunitygrocery.com/uploads/1/3/2/6/132695572/valudofowal-xujowamujojef-kudemusat.pdf
    • http://jidasa.lj-nelson.com/uploads/1/3/1/3/131379179/tevebusexajirot_gopimavifawukot_karerexa.pdf
    • http://files.trilogyhiking.com/uploads/1/3/1/4/131407424/cd4918856db11b.pdf
    • http://files.sactownappraisals.com/uploads/1/3/2/7/132710748/eaf6324647e45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/nofer.pdf
    • https://cdn.shopify.com/s/files/1/0432/9118/1214/files/17531740226.pdf
    • https://static.usrfiles.com/ugd/6cf804_3912f8a4f7e64483a28ee726ab1825a0.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_c5eab11cc5384241a47c9462ac8224d7.pdf
    • https://static.usrfiles.com/ugd/c1de29_14878bc90b9d44adb1b4a6b79ded05e9.pdf
    • https://static.usrfiles.com/ugd/8e66a5_679231d1deed4321808ab9e6635cec47.pdf
    • https://static.usrfiles.com/ugd/7f5dc5_c0469a60465242099c7f2c8893e29eae.pdf
    • https://static.usrfiles.com/ugd/3b7182_077a5a5cd11a4eb4a540bff3c23016de.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007490.bin
7b08addaf41b03cfab4cfe7b3a62e12b5a127c6f07a2d3c7dd248ddfd89f001c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7490 5912 bytes
font_01_sfnt_off000088a4.bin
efc24b37032f5f038819243e5c3c8ad29a6e9f5cd19863f9eadb50bddec96704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A4 10748 bytes

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