Malicious PDF — malware analysis report

Static analysis result for SHA-256 182f4c4174562b9d…

MALICIOUS

PDF

45.2 KB Created: 2020-09-02 19:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fdeb70c7f47dfd5feb661688dc1e92 SHA-1: 0e0e06d7162a99418ffe308c2d6997190d625bc5 SHA-256: 182f4c4174562b9d5250bc740413b2338a4138f40d0b2f5e162803e40cfeaab7
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The presence of a 'download button' lure and numerous external links, some benign and one malicious, suggests a phishing or scam attempt to redirect users to malicious infrastructure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=holt+biology+chemistry+of+life+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/2953/9485/files/business_letter_format_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/international_financial_management_eun_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/24784577132.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/31480569924.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/wenetize.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/aptoide_tv_apk_for_mi_tv_4a.pdf
    • https://cdn.shopify.com/s/files/1/0440/5713/3221/files/85657390222.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec67cc3a1201451396d892e0c2da5cc6.pdf
    • https://static.usrfiles.com/ugd/dcbeda_4cdb328deef040c485dd8d1bebd34222.pdf
    • https://cdn.shopify.com/s/files/1/0431/7256/1050/files/43996469675.pdf
    • https://cdn.shopify.com/s/files/1/0458/0219/3062/files/coreldraw_x6_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/et_misericordia_magnificat_bach.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_off00006d9a.bin
93aa261417270ac1ed9c1035db29b2a3b6dae24f7d6f82fe453aff4a9c14aa17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9A 5652 bytes
font_01_sfnt_off000080c7.bin
bbb196fbb5c6cb90fbf65479908a09ede085794d85284fcf3603f4179d7e5fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C7 10904 bytes

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