Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73db65ac8f0d91a…

MALICIOUS

PDF

42.5 KB Created: 2020-10-31 00:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ebb4c1012c181b80e132782a137c41ae SHA-1: 729b03ac583c36e7a1f13efe444189a6e5efaa1f SHA-256: c73db65ac8f0d91a59a6f335e942b70a3c5c76d03342a1537d3c0a7ce93ee5e1
182 Risk Score

Malware Insights

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

The PDF contains embedded links and text suggesting a lure for a county tag office renewal. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary malicious payload delivery mechanism. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/aws?keyword=barrow+county+tag+office+renewal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5f8eb3415d1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f89cbf0bf335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3237/0074/files/tuvuvedakikonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9736/7734/files/tv_guide_sydney_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/hong_kong_disneyland_map_download.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/dabokabipematalulozetazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6657/7062/files/netflix_mod_apk_free_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/clinical_pharmacy_therapeutics_roger_walker.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/simone_de_beauvoir_das_andere_geschlecht.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c30aaa-1849-4ac7-9ad9-aab51568894d/41013834889.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59AB 4996 bytes
SHA-256: a5f7756e6eaa3df974c9b395ad04db3b6875ad37198047149d2b6b50e39f88c9
font_01_sfnt_off00006ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD4 10752 bytes
SHA-256: 7b227d31ac0f770e7873888cb37643d42197d6bdbacd3963169abe427ff8a2e8
font_02_sfnt_off00008f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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