Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c3ede50effab1…

MALICIOUS

PDF

40.1 KB Created: 2020-07-09 11:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c98e99cdafdedb1f0ccdf44b0f3077 SHA-1: e3815ba0b0bc7b24ab4cdcd6d246942898226b75 SHA-256: 684c3ede50effab178e20ad68b8f13ac08294a155d0dc7c8b657da50bedd1ba1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, forming a link farm designed to direct users to malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL further supports this. No scripts were extracted, but the document body itself contains the malicious URLs.

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=present+simple+vs+present+continuous+perfect+english+exercises+pdf
    • http://files.daniellerosephotography.com/uploads/1/3/0/9/130969294/rikivirive.pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.killeenalphas.com/uploads/1/3/2/7/132740458/469238.pdf
    • http://files.cathydonahoe.net/uploads/1/3/1/0/131070523/3ba826fbc0fc.pdf
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdf
    • http://files.riveracorps.com/uploads/1/3/1/4/131408364/4a1a01922745f1.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.bampilates.com/uploads/1/3/1/4/131438741/1940dcd9a51.pdf
    • http://files.pgtaosa.org/uploads/1/3/0/7/130775520/32560125e006306.pdf
    • http://files.angiesmithsphotos.com/uploads/1/3/1/6/131636601/d49dd127.pdf
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rigumiroviwe.files.wordpress.com/2020/06/90355023023.pdf
    • https://porafofaj.files.wordpress.com/2020/06/75744016669.pdf
    • https://kugolofoto.files.wordpress.com/2020/07/85569006030.pdf
    • https://lijopiwa.files.wordpress.com/2020/06/zexokugurofatimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46456123156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.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_off00005d70.bin
0cc23cf9e73e4d27be46980b8b39cd8fc54ae60b54151950d0bd9760db35d4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D70 5368 bytes
font_01_sfnt_off00006f85.bin
e2d0a351fc7639de6392fac2fba0cb1dad291a95207b31142c7b933d4d1f2e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F85 10176 bytes

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