Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b3e5dbb3badb7a…

MALICIOUS

PDF

46.3 KB Created: 2020-08-23 18:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb08ab668d423f9b3c9bf3a03752164 SHA-1: bf20e9996ebb6f69faaff4be7a2e22d2d398f842 SHA-256: 19b3e5dbb3badb7a7e46b0c327cf67460fc315cb4313b2f348cee0398f869771
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=busybox+pro+6.+7.+9.+0+apk', which is presented as a download for an Android application. This suggests a phishing or malware distribution attempt.

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=busybox+pro+6.+7.+9.+0+apk
    • http://debubito.camerabeanbagsupports.co.uk/uploads/1/3/1/6/131606349/wizafofajo.pdf
    • http://radazi.patagoniafallfestival.org/uploads/1/3/1/3/131398294/3547936.pdf
    • http://files.butterflyposturalchair.com/uploads/1/3/1/8/131856713/kufaxadesotumumepa.pdf
    • http://mibefufo.windsongpreschool.com/uploads/1/3/0/7/130738714/2946490.pdf
    • http://files.theschoolofmakingthinking.com/uploads/1/3/0/7/130776363/5f844b4b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8046/6080/files/continental_ag_annual_report_2010.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/63397190687.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/ataxia_espinocerebelosa_tipo_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/49467893916.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/83530262050.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/tujikebikenazijutevul.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/7864780534.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/chemical_properties_of_alkenes.pdf
    • https://cdn.shopify.com/s/files/1/0459/1924/0341/files/87940281454.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/xolepomegisixus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/papixusisijipe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/52487397004.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/encyclopedia_britannica_eleventh_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6446/7357/files/binenuwi.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_off00006cd7.bin
430a431e8ee7458560100ff1e7c44f50dff1c34a9f0b7c4d0beb292908440c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD7 5768 bytes
font_01_sfnt_off0000809f.bin
d31ff5fe1e21b11a1c07b6c06a347283c742841d6c02229c91773b502d63e5dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809F 13596 bytes

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