Malicious PDF — malware analysis report

Static analysis result for SHA-256 527a4e9dbc72ef4e…

MALICIOUS

PDF

42.1 KB Created: 2020-09-05 17:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5dd32786f8ef076ebf527a6b656f52cf SHA-1: b5f74977d0f87241b35d8492c1c8f8d1e6e9dfe3 SHA-256: 527a4e9dbc72ef4ecb3dbd5851ac87021f9b4a41ba57c71fc249f3db8224af08
154 Risk Score

Malware Insights

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

This PDF file contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, suggests a lure related to a "mathematics calculator app". The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, indicates a potential link farm or SEO poisoning attempt to distribute malicious content. The primary IOC is the redirector URL, which is likely used to host or deliver a secondary payload.

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=mathematics+calculator+app In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/31293219057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/81199184365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/36093520753.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/353d00_2371f53d7fff453d9e711a38020744ec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ba3095_0dac1fdea1314bd698b6a06f90d7e494.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6846fe_86427a74036042f689e85fc09e1efa36.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ed2d23_3b76c25d59b74381ada247be65f305dc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4e6dd5_989c178927814bd784f5d64cfda40e22.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e7e4a0_2d616fbccdc34cb48fd86c9f059777b1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/769f78_72f5094380464768951d84acdf1faf13.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8da65f_d41288e670a04f249ae90b9316e2b669.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/359e64_8be6d6b360a5471c967167392f7e402c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6766 5180 bytes
SHA-256: 058800c1e84030563b0dade5611f260778ae5d8b5632b4f8dde489444747b864
font_01_sfnt_off000078e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 10136 bytes
SHA-256: dcc045f0179f2d538dfa5c2c0ce37d1aa77872ddcccde29e1370085f09c84ab3

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