Malicious PDF — malware analysis report

Static analysis result for SHA-256 52244a696f1bb80f…

MALICIOUS

PDF

42.7 KB Created: 2020-10-14 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bba55b402036d654b44e3ec654c0df0f SHA-1: 85e992715ebb42e08dbddd80bbfc032add3092b1 SHA-256: 52244a696f1bb80f15b0746576aacfdd831b12cf06951fbc011822a41aaed8cf
194 Risk Score

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://gettraff.ru/strik?keyword=chemistry+project+file+class+12+pdf+download In PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/16645440401.pdfIn PDF document text
    • https://site-1038674.mozfiles.com/files/1038674/topuge.pdfIn PDF document text
    • https://site-1042679.mozfiles.com/files/1042679/34026715767.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/56542953401.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/1/0434/0360/8214/files/43276980036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/52905302799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6131/2664/files/fikaduwavi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7850/8440/files/13_more_days_in_hell_silver_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1593/7441/files/68901966648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8771/9320/files/nih_stroke_scale_group_b_patient_3_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8560/6296/files/go_math_grade_5_lesson_11.11_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4827/4582/files/tiwodeninub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1873/0902/files/29454468835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9774/2230/files/investigacion_de_operaciones.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_off00005890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5890 5660 bytes
SHA-256: bbc76cf1ccb335b9d98f9e5b08962ff0b293175ab53068d593aa541770b4745c
font_01_sfnt_off00006bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCB 10436 bytes
SHA-256: 2619be6782cd80575ee8cfc18a3ad519abefc8d5960352b532db93df0f7216e8
font_02_sfnt_off00008f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F80 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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