Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a69ff8787b2c4db…

MALICIOUS

PDF

48.4 KB Created: 2020-08-03 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef275927f93316c14037ef79d837b361 SHA-1: 0cf30e967a9fe8d1629a50d752e1ca8038299561 SHA-256: 5a69ff8787b2c4dbc8dc9f1cfbd21573bb5e74a7e546ed82a5191493dec9060a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised as a free textbook download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is part of a link farm designed to drive traffic to malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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.ru/pify?keyword=sabiston+textbook+of+cardiac+surgery+pdf
    • http://files.simuelconsulting.com/uploads/1/3/0/7/130738969/9ccc3924cd5.pdf
    • http://files.studiobdancecenter.org/uploads/1/3/1/8/131871970/20fc3209aaea7c.pdf
    • http://files.rachelmillercalligraphy.com/uploads/1/3/0/7/130739328/wemuzezetuze-godoxem-bafumadusudi.pdf
    • http://files.usemillennium.com/uploads/1/3/2/6/132682327/eae88421a34418.pdf
    • http://files.timelessvaca.com/uploads/1/3/0/8/130813364/rufix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/disawowabodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7181/6358/files/40343972370.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/51700698874.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/22416543119.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/adobe_indesign_trial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/30254965836.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/32760632436.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/wapasagowepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/dynamic_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0444/4743/2871/files/facing_your_giants_max_lucado.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/rimagatob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/58671758012.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667a.bin
4de6c99e78aa8150b69b525815a7864c30b5d6e864346e7af7da0802718c56f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 5768 bytes
font_01_sfnt_off00007a3c.bin
d1bd65f2810862853d26022ead4404c9ced6110056513287a15802d31c9391ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3C 10668 bytes
font_02_sfnt_off00009efe.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFE 16204 bytes

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