Malicious PDF — malware analysis report

Static analysis result for SHA-256 769607cb8e05920e…

MALICIOUS

PDF

49.1 KB Created: 2020-10-30 20:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 72240f0d9a489c17b7de0054676c643d SHA-1: 3b5534fdd219bac1f9b8d24eedb7055d40a25d90 SHA-256: 769607cb8e05920e603dd0258f3ae68e019cae63bcda3ddf884d43b815a13502
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm and a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it leads to malicious infrastructure. The embedded URL `https://ttraff.link/123?keyword=psychrometric+chart+relative+humidity+temperature` is a primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a phishing or scam attempt.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.link/123?keyword=psychrometric+chart+relative+humidity+temperature In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f886d8dc6979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f9a1ef5ded00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8714d545cdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/zozabedusomasifotozipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e237c733-5f35-4267-89dd-78eb98fed5ab/iodine_123_thyroid_scan.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/administracion_de_la_calidad_total_roberto_carro_paz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2911/4275/files/pop_culture_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/74784386313.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/nepage.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/automatic_bottle_filling_machine_using_plc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7bfc96-ceae-4eb3-b997-4ffea4baf80e/pekugikow.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_off00007a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2A 5476 bytes
SHA-256: 2f6ac2eb596babf16db836874c2fdffa94b45ed1c413eff2c8160880e1ca578d
font_01_sfnt_off00008cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAB 12948 bytes
SHA-256: 126e433f47cd865e74e19ed3c436f83f05409eb1be95c00fed155c1fd0f31983