Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb8c4dcd016646…

MALICIOUS

PDF

45.1 KB Created: 2020-10-27 02:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d192f1c6556650b7a7469437be5330f0 SHA-1: 1a5ae0178a7b8fd77aa640267379c68d1640e846 SHA-256: 0abb8c4dcd0166468d0531b6d9ad1f1e840fd477d56b70554ce7db2a707b2808
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a link farm or SEO poisoning tactic to direct users to potentially harmful content or phishing sites.

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://ggtraff.ru/123?keyword=toy+story+ytp+collab
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/8045519.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/natubanewa.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/f94717728fa7.pdf
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/dotikomon-bufazubiwofoji-piriwonoma.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f96908ace1db.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f878f3f5f56b.pdf
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f8cf818100ca.pdf
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f952facabbd6.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/ribazewuloxonedutu.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/galebigajetij.pdf
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f8f095d57f5c.pdf
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8879c5c38d6.pdf
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f93135431249.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8a7b387bed6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nawosineromigi/ielts_band_score_chart_academic.pdf
    • https://s3.amazonaws.com/wexukufedepim/17029166064.pdf
    • https://s3.amazonaws.com/zakunafu/sovotalibetatapelatod.pdf
    • https://s3.amazonaws.com/wonoti/gomimuz.pdf
    • https://s3.amazonaws.com/subud/bosquejos_escritos_para_predicar.pdf
    • https://s3.amazonaws.com/leguvefu/domaxafasuritovapumusef.pdf
    • https://s3.amazonaws.com/mozirolinitaje/vabinelamelugi.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_off00005d74.bin
3055c2507987c62815648d71f470423dc643dc3e0ba90ef103c21e43b1cc80be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 5120 bytes
font_01_sfnt_off00006ef4.bin
734c625ac688a0f89b88ae44b8393df8a589358a50f163bb460c18e6e72996f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 10124 bytes
font_02_sfnt_off000091ca.bin
10572f3a10760712fbb8352e098d229fd21f48763f52fb6fd9385479015ceb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CA 16060 bytes

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