Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e9dc7d0ef13ba4…

MALICIOUS

PDF

72.8 KB Created: 2020-08-12 13:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 754351272062bce43de3b8e41ec95b91 SHA-1: c6420cc25a43a8b16207bcebaf2f573adceb4311 SHA-256: 74e9dc7d0ef13ba444e8c348c93c34d498daaee562ed4d4890c476dc29a1068f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a link farm designed to appear as legitimate search results, with the primary malicious link pointing to a redirector. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. 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.cc/pify?keyword=zkteco+attendance+management+software+user+manual+pdf
    • http://sadane.nthf.org/uploads/1/3/2/6/132681218/zekibed.pdf
    • http://xezefaxa.craigmorelocksmiths.com.au/uploads/1/3/1/4/131483068/zuvikidenobudaxoruru.pdf
    • http://files.sgesurfreport.com/uploads/1/3/2/6/132682295/rabunotubilijivam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/46853287138.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/21456835894.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/transporter_3_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/aeroplane_engine_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/le_rapprochement_bancaire_en_comptabilit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/69390004079.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/psychology_10th_edition_myers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/29958431788.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/60658378016.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/low_back_exercise_aaos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/sutubovozar.pdf
    • https://cdn.shopify.com/s/files/1/0438/8628/0872/files/manorama_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1741/2501/files/toviximoguboxowide.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_off0000dfbd.bin
4ba2d628ad70913794c07bac2f2a358947cd8bd0f45c37734c009e7b229d8397		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 5588 bytes
font_01_sfnt_off0000f2be.bin
fed6fb48c4dd3ef63679d83caae92135aa330fdd5374030452ccf53497979bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10252 bytes

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