Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b86879161dd6587…

MALICIOUS

PDF

59.5 KB Created: 2020-08-23 02:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f005ffa68c7e6aae81ed425b0b00ee70 SHA-1: 63a3bac99bf7ba60c137ec93fcd8da3349ab2e49 SHA-256: 4b86879161dd6587bc4ec363a0f5221164c88403e74ef144fb9fc763d3b6617d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Bhagavad gita book in english free' and the malicious URL, suggesting a lure for users. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious redirection pattern. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict.

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.com/pify?keyword=bhagavad+gita+book+in+english+free
    • http://files.thechickabeechannel.com/uploads/1/3/1/8/131857655/lovomipadevapoziso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/xexafosiranijuxod.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/84547720643.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/nazonaripog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/69382072209.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/mourning_ends_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/6778787672.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/relationship_between_sociology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/78330877553.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/drake_all_me_download.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aac4.bin
c96a62ec3747d704dff2c93dbcdde6bd8f55d59a2a7e75f2934d08ec894f1737		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC4 5480 bytes
font_01_sfnt_off0000bd6a.bin
c5ebd3ae2fbea642f10582805a8c982f7c68766ef180418ab05bf55ecae1e086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10812 bytes

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