Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e1b71eb4719945…

MALICIOUS

PDF

67.2 KB Created: 2020-09-01 03:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bef2a471ad7be2f0bce31b1a0b5e285 SHA-1: 213af5e547c1a42594db2c6f769504c9ebcd9ae2 SHA-256: 66e1b71eb4719945e1e145002ea46d7ee5e5831eddd89b0f831a230a6634aa06
182 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as author information for a scientific journal. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. No scripts were extracted, but the primary malicious behavior is the redirection to a harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.com/wix?keyword=annals+of+oncology+author+information
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/tusuxoxebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/ritolurasavasujebetej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/famivepesawowimox.pdf
    • https://cdn.shopify.com/s/files/1/0435/5742/1224/files/sap_basis_administration_practical_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/11939156494.pdf
    • https://static.usrfiles.com/ugd/8cbfce_fbb42c00d01b4950ad8fedbd31ca93fc.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/2007_jeep_grand_cherokee_reviews_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/mckinsey_influencer_marketing_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_8993dd88c994467eb4517eec2cb07eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec8c941a7d414054beb542e1639821aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_73c01e9f6fc3485c9e71736f766de4b6.pdf
    • https://static.usrfiles.com/ugd/353d00_5f52130a53e246cb8858a93f4e2f9b7e.pdf
    • https://static.usrfiles.com/ugd/409ca8_6a92c96b550240f68e7900dae057060b.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_off0000c873.bin
197fc8e884d39c8d510ef40a6154b378048a660588af59f020a4a094501a9d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 5388 bytes
font_01_sfnt_off0000daa5.bin
2bb394c78f39d47e7a8d9553bad08074885b4cb17d0cacf7a44b731e396265b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 11096 bytes

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