Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ecc06933c39edb…

MALICIOUS

PDF

37.2 KB Created: 2020-07-31 17:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f3015ba36c16c54ac8d105609f76c88 SHA-1: 1fb103d6f215c49a44bc5a046b5ec3fd83c41b5f SHA-256: 15ecc06933c39edb51befa1929828335ba0ca8263d88b9bc57e8b399e8c54f21
174 Risk Score

Malware Insights

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

The PDF contains a lure related to a "Dell service tag checker" and embeds numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL. The presence of many external PDF links suggests a link farm or a method to distribute further malicious content.

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://ttraff.cc/pify?keyword=dell+service+tag+checker
    • http://files.twohomeschoolingmoms.com/uploads/1/3/0/8/130874141/2001526.pdf
    • http://files.cvbama.com/uploads/1/3/1/4/131409761/6261d3.pdf
    • http://files.profshanks.com/uploads/1/3/0/8/130874241/rulofenu_bojes_dedeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/73313346967.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/84107359556.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/raxogegom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/12320026683.pdf
    • https://cdn.shopify.com/s/files/1/0438/7959/6187/files/rifemuziwezawageriril.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/gonamupelumur.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/zefimope.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/46374934339.pdf
    • https://cdn.shopify.com/s/files/1/0439/2982/9544/files/komavutinatafowok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/42999096973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/70012105485.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/biviwuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/komaxuf.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_off0000526a.bin
319bfbd4241c4159a382e704b1f53eb0d4bc5e38712e7dcbef33cbcf92047c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x526A 5184 bytes
font_01_sfnt_off00006415.bin
945042297710ca60b79c8a8384ece099cd37cf6e8b880212aeeb9c15fe3473aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6415 10528 bytes

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