Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd293e492855d48…

MALICIOUS

PDF

54.5 KB Created: 2020-11-01 23:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 898e38f74260468a678b0ba775dc3f91 SHA-1: d0df3247b8871664f7081a24fcd2f17977e06f7a SHA-256: cfd293e492855d48f2b98be7a88cf2693adea07c42b3a6686084e644ae918783
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to a 'contribution refund 2020', consistent with phishing or scam attempts. It embeds a link to `ttraff.cc`, which is flagged as a malicious redirector. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of malicious redirector links and the phishing lure strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=nht+contribution+refund+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5f934cc406f96.pdfIn PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/8172027.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/1286830.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/1/0494/1142/4423/files/fun_unblocked_games_google_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/79511169538.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/sierra_tucson_reviews_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/85088580221.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/vamidifim.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/88701383304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0114/7302/files/synonyms_for_logical_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2241/8839/files/9865787922.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/anticonvulsant_activity_of_medicinal_plants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1029/6480/files/gba_emulator_apk_download_full.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F2 5072 bytes
SHA-256: dc099eee025820569b112aa46211fc2beb0225e70dd4136ac7026470786691ce
font_01_sfnt_off0000842d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842D 2056 bytes
SHA-256: d904a595ff714ad3fcd0c0b7d89ca0d4475eb75da02f9fa4ce2b320a59d453b5
font_02_sfnt_off00008dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC8 11636 bytes
SHA-256: a0c7fde09320a1d610379a13fb2614db9fa54685235f2fe97b946125bcd09f48
font_03_sfnt_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 16640 bytes
SHA-256: 94e5f18de2519413859329367b951a41ffa4d6ad982523c336ff5b10541fa3c1

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