Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff83ed285dab689…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 01:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9bc71358aeaf4c24c15524e57212e66 SHA-1: 49fa034188b5793737b681eaade3384822504cca SHA-256: dff83ed285dab68916de5999dbcf696408bfe582256008a9e9ae3a874b3e558d
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is a common tactic for distributing malware or phishing sites. The document body and embedded links suggest a lure related to cracking software, specifically mentioning 'Avast free antivirus crackeado'. The presence of numerous external PDF links further indicates a link farm strategy, likely to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=avast+free+antivirus+crackeado
    • http://files.underlineconnections.com/uploads/1/3/0/7/130776661/beb7cef8b.pdf
    • http://rebox.businessfruit.com/uploads/1/3/0/8/130814238/bepamiw-fazowavugadu.pdf
    • http://jiregixi.renatalindroos.com/uploads/1/3/0/7/130739704/joxatafani.pdf
    • http://gugup.wakefieldpodiatrists.co.uk/uploads/1/3/1/3/131398101/9651453.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/xixuwozawamekeduvosuxa.pdf
    • https://cdn.shopify.com/s/files/1/0452/1289/3344/files/ascii_format_for_network_interchange_standard.pdf
    • https://cdn.shopify.com/s/files/1/0433/0301/0459/files/escola_de_administrao_cientfica.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/vijitemikepomulivitovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7505/files/nonijozado.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/bahan_ajar_akuntansi_keperilakuan.pdf
    • https://cdn.shopify.com/s/files/1/0440/1509/1870/files/clerical_ability_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2811/7661/files/bujokoforonasefinotapelem.pdf
    • https://cdn.shopify.com/s/files/1/0436/6955/3305/files/definicion_de_historia_clinica_psicologica.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/digestive_system_diagram_blank.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_off0000673d.bin
38291133d82f9385399c582582935f30047a6f6c60408a2ef7f2d16a57900de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 5096 bytes
font_01_sfnt_off000078a2.bin
38b09898ce89e65c587df0caddcc4799865de65452131fb9e1cbeee3f5b15da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A2 10156 bytes

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