Malicious PDF — malware analysis report

Static analysis result for SHA-256 20066b4bc2349c7b…

MALICIOUS

PDF

35.2 KB Created: 2020-08-19 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f57a1df5321ca3d631ae7e2b48df1c SHA-1: 91631baa5e23c9b1d3fdbad732beeacec58c4aec SHA-256: 20066b4bc2349c7bab483670d8226d10b8495ec6a2d7b2d9c5ec84364d260bdc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing 'Happymod apk 2.0.0', suggesting a lure for users seeking software. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the malicious redirector. 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.com/pify?keyword=happymod+apk++2.+0.+0
    • http://nabazitif.bgshelterpets.com/uploads/1/3/0/7/130739274/wurekof.pdf
    • http://files.heightsafesolutions.com.au/uploads/1/3/1/3/131381901/8684835.pdf
    • http://bogisub.imagineadv-webbanners.com/uploads/1/3/0/9/130969162/ae5825f.pdf
    • http://files.supplychainconsultants.com/uploads/1/3/0/9/130968994/1648454.pdf
    • http://fipovok.rosemaryhill.org/uploads/1/3/1/4/131437615/3e5f8709e.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/resident_package_log_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/reference_book_biology_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/sabawer.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/95448595282.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/xonuxixulo.pdf
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/laxujojaziwovum.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/96451145159.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7920/files/english_speaking_for_dummies_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9681/6282/files/lens_mounts_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/83370377134.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/lujuvevoloboxaze.pdf
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/job_description_accounts_assistant_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fapodepemiretewuroraga.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_off00004c77.bin
5a110bc7150e64d3decba7fd44361db5ce532a95bfeb70f4d283698a54f776ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C77 5232 bytes
font_01_sfnt_off00005e43.bin
d04d5b535e9899a94bcfbca41a9e90e968621fa561c26e0660dac9a65ea93d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 10020 bytes

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