Malicious PDF — malware analysis report

Static analysis result for SHA-256 11887bb123dbe881…

MALICIOUS

PDF

61.6 KB Created: 2020-08-11 23:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810b4f5781e645b403dde218585dd4a8 SHA-1: f805cab91b7bb61a72363ce463292a55b34fe8d4 SHA-256: 11887bb123dbe8819d265b26f23b3aeb7caec7176d88eb9196721e40db6f5574
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to trick users into downloading further malicious content or visiting phishing sites. The ML classifier also strongly indicated maliciousness.

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=south+african+coin+catalogue+pdf
    • http://files.hairbylola.com/uploads/1/3/1/4/131452836/xepaxejatalaz_busunixabuse_zawufoverenaza_lasemir.pdf
    • http://sazufap.rsgallardolaw.com/uploads/1/3/1/0/131069839/9569923.pdf
    • http://files.ea-abc.org/uploads/1/3/1/4/131409463/8757175.pdf
    • http://jades.bluedahliamakeup.com/uploads/1/3/1/8/131871390/753aab5b.pdf
    • http://woxokekop.photonomadtours.com/uploads/1/3/1/4/131406749/5503769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/robekusopuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/budget_making_process_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/maths_questions_for_class_9_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/9150/6840/files/41333592076.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/getidero.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/xezinare.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0430/7874/6261/files/2815001743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/java_draw_graph.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/82515408469.pdf
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/ffxiv_treasure_hunt.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f8c.bin
e8555d49d22572b8777aa2cd8472fea290c9a616d3ed6b6d187e17d659864644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8C 5340 bytes
font_01_sfnt_off0000a1ab.bin
46dea71425199bddd7a6dce2d18f1c1516e080dc631f70f59ae0d1c2871ffbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AB 16188 bytes
font_02_sfnt_off0000d3c6.bin
479b9ed2b38c3b2436d467d04f2a5b901543c080f2594dac8580bde17b2d0a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 16172 bytes

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