Malicious PDF — malware analysis report

Static analysis result for SHA-256 1077088ab5bc1db4…

MALICIOUS

PDF

34.2 KB Created: 2020-10-31 03:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 15dfd86a03e27c4abb1857185d154e99 SHA-1: d4a707243d3ab0ac8e150f31e3a8fabc33036f8b SHA-256: 1077088ab5bc1db47dfeae491184ab0a5929f462213903b72c4dedfa4f2427ad
174 Risk Score

Malware Insights

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

The PDF contains a lure related to "Shelby county clerk office" and embeds a URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external PDF links, many of which are benign, suggests an attempt to obscure the malicious redirector within a larger link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://ggtraff.ru/aws?keyword=shelby+county+clerk+office+mullins+station In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5f96c2422b059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f95aede4a5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8d4fd33788e.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.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/1/0503/8758/3126/files/monthly_budget_worksheet_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/fovapuvoganeforukuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/52065836769.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/80494350966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8524/1759/files/dead_trigger_2_apk_obb_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/biogeochemistry_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/68874361707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607d710a-58e3-4b89-b10e-c50b1b424c6f/nys_court_officer_exam_2014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7990/7513/files/tekonokumefe.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_off000045b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45B5 5528 bytes
SHA-256: 4b5cf2d7a752b27199098d8bb875816612e244d9b627f8a985c792ec927329f7
font_01_sfnt_off0000585f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x585F 10520 bytes
SHA-256: e9b1acdc279cec9125543c8df0b0886fb3f06397f485258277e50e10a725f54f

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