Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e9d5318d402bce…

MALICIOUS

PDF

46.4 KB Created: 2020-10-31 01:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cdf7422c5501678ac48c52be9a477d46 SHA-1: ea2e7ee42368ff387348e61412984cee9edceb8b SHA-256: 23e9d5318d402bce1258526fbc312e4264f7e1342893f66310b58b38ad00a5e4
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=att+business+direct+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f89eae8ac09a.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/vapisaziko.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/354ecd36.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/4198164.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f96e891a6f6b.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/1/0502/3937/3501/files/tadirako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6153/7689/files/raspberry_pi_android_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1717/2640/files/86881271868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7524/8543/files/obd_tools_km_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3549/8949/files/jamemufarujavonid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8486/4415/files/42399812038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d939b1-d892-49fb-b594-74e73691185a/2826863835.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_off00007577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7577 4972 bytes
SHA-256: 4f77b68fa6df07beefa229067803fad656b3c3a650ad53120bdaa73a715fbf12
font_01_sfnt_off00008647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8647 11276 bytes
SHA-256: 0c8c38963a7f291cac10539762bab53b9bb7cc8be5533c9635b80ac8fb793a80

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