Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea6766fbb8dea54…

MALICIOUS

PDF

39.2 KB Created: 2020-08-19 13:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f806c343f777b0ef5bc42230820b06e SHA-1: 1c83c477d95eec09150bf8eb85e4e4815e992eab SHA-256: 4ea6766fbb8dea54e4093e129c13e82e07d6e8ba2aa40b64603c6b2b32cb6a62
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=adjective+worksheets+for+grade+2+with+answers'. Another critical heuristic identified it as a PDF SEO link farm, containing 19 external PDF links, many hosted on shopify.com and other domains. The document body, though heavily obfuscated, also contains the primary malicious URL. No scripts were extracted from this sample.

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=adjective+worksheets+for+grade+2+with+answers
    • http://bifeju.talbertsmaplefarm.com/uploads/1/3/2/3/132303108/405b60366b17d.pdf
    • http://files.pitchperfectok.com/uploads/1/3/0/7/130740490/e50a66db3f.pdf
    • http://morev.harunaflute.net/uploads/1/3/2/6/132681927/kigoridiji_bupevirosorisu.pdf
    • http://jomutev.nutritionistforhealth.com/uploads/1/3/1/4/131406934/fuxev-sabogew-pemimapobe.pdf
    • http://files.cleancooks.org/uploads/1/3/1/1/131164124/zuvibetu_zokax_wofirubizefebiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/76897116876.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99781003244.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/purexenine.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/42036811171.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/juniper_ex3400_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/56671836134.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/bsf_bharti_form_date.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/87377844453.pdf
    • https://cdn.shopify.com/s/files/1/0439/2730/6408/files/stormtrooper_armor_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/equivalent_fractions_worksheet_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/44217455810.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/vogumifepokebanunegireg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/puloxumomezumuzepifowix.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/befakawudiketurunifuf.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_off00005987.bin
b7653b53b3b15aba69f2a11f9617816aa2b8d1c64d378de78b0f77efaad5bde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5987 5664 bytes
font_01_sfnt_off00006cda.bin
6a8c4e5a705387f5d42de4498cb49434a56c42dbe095672e9e57450a96035099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 10064 bytes

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