Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3bdb005f68d790…

MALICIOUS

PDF

51.5 KB Created: 2020-08-13 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff34dc3170eae85b72cb69903dec08d6 SHA-1: 40f616297c7e49770ef4330682c6dafb6bbcc3f5 SHA-256: 5d3bdb005f68d790995e86acfcf4b6aae66fb2921aa53f2e3f7a4f103b226b9e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content across many sites. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely leads to further malicious content or phishing pages.

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/wb?keyword=digital%20modulation%20types%20pdf
    • http://guvuduvip.ibnghareeb.com/uploads/1/3/1/4/131437987/dimemir_wiwexikirarija_jewix_tekikorado.pdf
    • http://files.leongsmeathousekauai.com/uploads/1/3/2/6/132681443/xenidevigo_pamogo_pofugoferirol.pdf
    • http://files.americanfoursquare.us/uploads/1/3/2/7/132740218/majibomavapakabopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/16401003886.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/fukuza.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/aprender_caracteres_chinos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/durarulivonolamanisugaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/22111388630.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/pay_pal_fees.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/new_aadhar_card_application_form_download_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/zujamepurigukatenukubupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4315/files/reralowut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/aromatic_heterocycles.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/fujedotuxilidowivagefale.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/cashless_policy_and_economic_growth_in_nigeria.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_off000089fe.bin
a7cdc98ad7a050035127e54849974b29f09c554d83d405da0e70162ce1310012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FE 5364 bytes
font_01_sfnt_off00009c43.bin
768d53a6a455f54e6e264b35a1cda2e02a5fe732502466562e3cc38a1ca8c6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C43 11156 bytes

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