Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d4a8866d954746…

MALICIOUS

PDF

48.2 KB Created: 2020-08-20 05:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fabd5708c2b6a2bedcc0241f5793b4 SHA-1: 45a9e0707656dcb5d6bbd89ca2e61b67e8f9566a SHA-256: 16d4a8866d954746c56000ce5a83d36b53ac74c806c718f01621657a3cedb259
174 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and a redirector suggests an attempt to lead the user to a malicious site, potentially for phishing or to download further payloads. No scripts were extracted, but the document's structure and link behavior are indicative of a malicious lure.

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=yookoso+continuing+with+contemporary+japanese+workbook+answers
    • http://gevufape.fleischerstudios.com/uploads/1/3/2/6/132680981/ruxomu.pdf
    • http://files.soeasyservice.com/uploads/1/3/1/4/131453605/9989913.pdf
    • http://files.1995wrangler.com/uploads/1/3/1/6/131606569/3400861.pdf
    • http://files.idfva.org/uploads/1/3/0/7/130775701/cc008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9200/0412/files/accounting_and_finance_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/co_branding_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/71659160827.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5534/files/92343291203.pdf
    • https://cdn.shopify.com/s/files/1/0440/2846/1206/files/17040986078.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/tesco_job_online_questionnaire_answers_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/romomakilododowuderavomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/74331263860.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_off00007dd9.bin
d2d75393b4551831d276f8f0e92ba55d75b668d9f33240b0b8971a37fe2e7dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD9 5748 bytes
font_01_sfnt_off0000915f.bin
5514a9c195e92cb5a4220adc6726f13c6d56971e0be74345fa0de42309d80253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915F 10148 bytes

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