Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd77fa42ccc5a4df…

MALICIOUS

PDF

71.8 KB Created: 2021-02-23 20:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7803a7c04aa1d7139628d4817e6eeba SHA-1: ce7ea10eff5b8a100c07377b10293a4fb6c19a58 SHA-256: cd77fa42ccc5a4dfad2615f5f4a4515613923821d76e082102c16bc0d6ec7ec6
164 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a payment redirection lure. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the document's intent to deceive users with financial-related lures. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest a phishing or scam attempt, likely leveraging a client-side exploit or redirector to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=metropcs+device+unlock+app+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5fef09f8b8e55.pdfIn PDF document text
    • http://ingmijn.com/89425300217myfjz.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/jazz_piano_scales_and_modeslgriy.pdfIn PDF document text
    • http://checkyourcredit.info/asterix_y_obelix_personajes_romanoszdrqo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_60016be4665ff.pdfIn PDF document text
    • http://therarbooks.com/how_to_reset_camera_on_macvxtok.pdfIn PDF document text
    • http://bandalet.club/how_to_open_multiple_files_in_one_documenttdxgv.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/ejcjcif/16486444634.pdfIn PDF document text
    • http://businesshelpservice.com/what_is_the_significance_of_the_title_name_j_alfred_prufrock51da9.pdfIn PDF document text
    • http://differencecheats.net/problemas_de_porcentajes_encadenados_2o_esosu1bm.pdfIn PDF document text
    • http://creamwalls.online/hamamatsu_photonics_k._k._annual_report5uaal.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/heie27E/32971536345.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/8ja4ggv/vonuwipu.pdfIn PDF document text
    • http://bachanalytics.com/weapon_sounds_fivemoq2wf.pdfIn PDF document text
    • http://goodshopsales.xyz/android_activesync_office_365kmbh5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_6003d45d60605.pdfIn PDF document text
    • http://reduslim-italia.website/nobatupeributuwaropm7bbd.pdfIn PDF document text
    • http://bezprovodov.guru/apa_format_referencing_6th_editionw1pze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafujegimeti.rf.gd/28817546404.pdfIn PDF document text
    • http://jamivofobo.rf.gd/debaseg.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/on_the_road_again_chords_grateful_dead.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5196 bytes
SHA-256: e78f5e5c0d71243c1c95a8c5ea871c719ab75855e2574afe8b677d39796e6c8e
font_01_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 14616 bytes
SHA-256: 399b2f2b169b106b2c5732b79888daf7e73539ae3e966d27cc31fccd97ef3b63

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