Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7277fb5e468b6e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-15 19:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 51cd20b2f4251c907977d50f3dcaa0b7 SHA-1: ab7ca79320af0bf8f1f2218ea0cd369797a33882 SHA-256: 5b7277fb5e468b6eb0910fbf328021e544a21f7fa44715d9db0c5ee5c94bfae5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL known for malicious activity. The document body also contains the same redirector URL, suggesting it is the primary lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports the malicious intent of distributing links to potentially harmful content.

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.cc/wb?keyword=zoltan%20dienes%20understanding%20psychology%20as%20a%20science%20pdf In PDF document text
    • http://files.anonymityfilms.com/uploads/1/3/0/7/130775939/meripidupini.pdfIn PDF document text
    • http://votalodo.childrenscoalition.org/uploads/1/3/2/6/132682156/jekivovoparuv_wikub_fakixuzur_dobuz.pdfIn PDF document text
    • http://files.telezapper.com/uploads/1/3/1/4/131483138/7472415.pdfIn PDF document text
    • http://gunamul.randomtraveler.net/uploads/1/3/0/9/130969723/jewoturujaneteja.pdfIn PDF document text
    • http://files.pfed.org.pl/uploads/1/3/0/7/130775125/dizawusaxosa.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/1/0428/9835/8432/files/87967576867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/ecology_lab_report_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/understanding_culture_society_and_politics_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9480/2593/files/comparative_adjectives_and_adverbs_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/phantomjs_print_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kenmore_sewing_machine_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/ratetotawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/zufidotonakasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8597/1112/files/app_secrets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/9050/3832/files/soda_license_key_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/application_software_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.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_off00006356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 5360 bytes
SHA-256: ed0cad8875fe1171280b0aeca6f30d34a874141c2b05d722a9a72093a4f6cc37
font_01_sfnt_off0000758d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 9948 bytes
SHA-256: 87257fc0aaecb1cb9a335179f6afc7c42d2d898456ee513fedac24f86098c09b
font_02_sfnt_off000097a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A2 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd