Malicious PDF — malware analysis report

Static analysis result for SHA-256 62aa69db293a3dcc…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 03:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af0804acaf8483ec95c9a258854dfe97 SHA-1: c2b759caab633c7eba15e8d50e73bab71c5d6eb9 SHA-256: 62aa69db293a3dcc04b8fc3ca109413d641265bccc353bf35042ed39724b137e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the URL for the redirector and other URLs that appear to be part of a link farm. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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/pify?keyword=admob+sdk+integration+in+android+studio
    • http://files.dixix.com/uploads/1/3/1/1/131164519/615d857a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/aoac_official_methods_of_analysis_18th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/tafisopibubudodijuwitupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/vupevenodesidaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/matagalls_per_collformic_wikiloc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/73546781500.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/reference_letter_template_for_fellowship.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/44997809711.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/business_analysis_reporting_tools.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_off00005f60.bin
4ecf80af2b139e07c83b9fe13da6713c29f0b5f7524ce56f2caa1c31b97d034a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 5308 bytes
font_01_sfnt_off00007150.bin
5121852d22d610cbe5d76e38ca60cbee4d977ec2f26660ee1dbd1af9d2cc4e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 10512 bytes

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