Malicious PDF — malware analysis report

Static analysis result for SHA-256 250237a8ac4e314f…

MALICIOUS

PDF

42.6 KB Created: 2020-11-02 14:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: da787b7e13d6722f2a1c91dd167400d2 SHA-1: f6bc6571a98ec09a8bfb070ece0d746de96a9eec SHA-256: 250237a8ac4e314fce9dd6804fccd9b18f0a3e281d27921a2d356f5036a2e7ab
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link impersonating 'chase' for credential phishing. Another critical heuristic indicates a link farm, and a medium heuristic suggests a callback or payment redirection lure. The document body, though heavily obfuscated, contains a URL that aligns with the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/7bd6a0ee845fb7.pdf.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/aws?keyword=bank+account+verification+letter+from+chase In PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/7bd6a0ee845fb7.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/gafadox.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/00363a.pdfIn PDF document text
    • https://fasefipuronupa.weebly.com/uploads/1/3/4/4/134471496/aa0a9419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3034/7435/files/18860478751.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/66075901477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1858/9636/files/chris_barker_cultural_studies_theory_and_practice_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/dead_trigger_2_mod_apk_unlimited_money_and_gold_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/pembuatan_biogas_dari_kotoran_sapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6361/3853/files/best_calvin_and_hobbes_snowmen.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/math_worksheets_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/34493086709.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_off000064b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 5296 bytes
SHA-256: 78fc66bd4fa326ce0a2d583eae9a8e0bc9147ace81084a74b6713179a9f5ffec
font_01_sfnt_off0000769c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769C 11400 bytes
SHA-256: 73982ebd1567a253320dd151cee2e96abb35e2c61d19cb61cebe3cc5bd18e116

Open this report in the interactive analyzer, or submit your own file for analysis.