Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57f051873beebfb…

MALICIOUS

PDF

48.3 KB Created: 2020-10-28 05:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2549242eed663f0c742e427ba8bf75d0 SHA-1: d48b21a6c75c04f8b0324370ba2c2a95e4b52b87 SHA-256: e57f051873beebfb649e1fb0cc84cc3aad213c782b872e66eb20ce48236c1d9d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to external sites. The primary redirector identified is 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains a reference to the same redirector URL, suggesting an attempt to lure users into clicking through to potentially harmful content, likely for phishing or malware distribution.

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.ru/pify?keyword=barbarians+of+lemuria+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5f95fc6f38a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f898a2f42f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f8b6d770bc91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f8ecd49cbdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f9804d21743e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/159bbe0a-aed8-4ac7-84b7-2afd3fcb0671/problemas_de_energia_cinetica_y_potencial_2o_eso_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ddf02a-bf07-4a5a-b886-86466f35e0e1/cabin_one_code_subnautica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7a4efc-e50f-4cec-ba7a-710d281c52ea/2000_mercedes_benz_e320_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0940/2774/files/tactical_barbell_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7659/2815/files/80564357929.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/47391076400.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/17840308346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5eebff-7bae-4619-8ef5-415bf58fc924/51215549861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb61a911-97a3-42f4-b2cb-43a5cd2c5a8a/21153241565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1273e2f-67eb-4fb5-9caa-61ee8c87ca9d/gumatuverejaropelezozaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7fa22a-ed43-4ba3-8405-f9967b64fedf/electric_pressure_cooker_recipe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2b9043-60c2-44d8-bf1a-fb0c9b1a1ec1/75484202475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935291c1-2525-4bc4-a62c-23d4e5231bef/white_salmon_wa_weather_averages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255e9fd9-1ccb-4439-a94a-10a0ed2e0caa/sc3000_sound_card_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffb6e4f-6b8e-4ee2-b746-9a7cc2ee8064/66246410609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01790189-43f5-4c7d-b6ac-452a61f8df1b/pasodokoriwotidavufijifow.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_off00007e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E55 5252 bytes
SHA-256: 48384e0ef0b74162b0c44325f90a3b5371836a4b68e68aaf645d7c07d8bb90a4
font_01_sfnt_off0000902f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x902F 10716 bytes
SHA-256: f1936ada311be7e4f93f84f60435e1c8edbfeb82c7b2052004bb6bb78249e696