Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea19fc7d8788559…

MALICIOUS

PDF

39.9 KB Created: 2020-08-13 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f378afebf27015a5e334a6b184d326 SHA-1: a79262809860017891d069bd52cd1a148806edf4 SHA-256: 9ea19fc7d8788559c3ff203607adb78731e12eea5b291a4c89b18cddf64bd212
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this redirector, disguised as a 'banjo kazooie strategy guide pdf'. This suggests a phishing or social engineering attack aiming to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=banjo+kazooie+strategy+guide+pdf
    • http://paliji.ironstoneconcours.org/uploads/1/3/1/4/131408027/gegawevudod_waxedopaku.pdf
    • http://files.littlehandsomez.com/uploads/1/3/1/6/131636807/8321914.pdf
    • http://vituxisa.whitewavemedical.com/uploads/1/3/1/4/131407668/takabufemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5873/files/90589576663.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/google_search_engine_optimization_starter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/51085305116.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/agriculture_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5472/5270/files/arabic_alphabet_worksheets_for_preschoolers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/65372552496.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/simple_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/41780237157.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/7488043945.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/chinese_ear_acupuncture_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/87110719766.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/abdul_hameed_adam_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/4025/0775/files/dubesusilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f1e.bin
67db6164f5731b2f5e7f0a28e5e5f73aed24f0678d6d8e99ba3c72f284cacca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1E 5400 bytes
font_01_sfnt_off000061a5.bin
fa38e1d9fd16f733874a75af41eb7a35665c30e491f94a087380933f64531af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 10128 bytes
font_02_sfnt_off00008461.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8461 4324 bytes

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