Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d87692b3b1a5129…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 14:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77605807bc55823428d7cb23359f5aa SHA-1: e8747ac661c522a98d693ec5a59afa57fd2391ef SHA-256: 5d87692b3b1a51298c027c1af609ba632dc208a09475f140a574d5c6fdb359f2
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which lead to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a malicious intent to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=advantages+and+disadvantages+of+probability+sampling+pdf
    • http://files.theapowers.net/uploads/1/3/1/4/131408970/dixirukifudu.pdf
    • http://files.pegsjewels.com/uploads/1/3/2/3/132303378/bigimed.pdf
    • http://files.millrdcommunityspace.ca/uploads/1/3/0/7/130775402/jimig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/velugifogesuvefolipez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/titan_air_compressor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/95454349714.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/94863263520.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8823/files/liduzajotilixoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0635/2804/files/99218711346.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/characteristics_of_genetic_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/zikuninedoka.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/how_to_make_a_group_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/kosoxa.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_off00006d35.bin
8f46cb1c3152836bd8cfc38b45bf9ce011a2a83257ce98aaf51f5707742fa821
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 5652 bytes
font_01_sfnt_off0000806b.bin
338d6b3dc65e50d978987e6f84fb84d330c738b9981922703e5080903a093389
pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 10312 bytes