Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af57c547d326f51…

MALICIOUS

PDF

42.7 KB Created: 2020-11-01 12:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62ae757dbdc32712ca71c0526ca083f3 SHA-1: e623dd4968f73b6f346b9d8a898eb139574762a0 SHA-256: 1af57c547d326f5130435898192ed95fac6cc96ca554ef1efb2599b4d3997b18
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one critical heuristic identifying it as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to trick users into clicking the link, likely leading to a phishing page or malware download.

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.me/123?keyword=hd+dash+camera In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.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/7d24a796-2c8a-4d02-b8d1-95c5c31b67b3/43838595395.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/jaridebepunilusuvogas.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/pride_and_prejudice_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/zuvew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7578/8700/files/key_to_the_kingdom_board_game_restoration_games.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/45124423867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/cursive_writing_worksheets_uppercase_and_lowercase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7333/0593/files/verb_conjugation_worksheets_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7ad812-468f-414d-bb34-23c93345d483/niwun.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/site_waste_management_plan_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0256/3232/files/great_gatsby_chapter_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7841/6037/files/terapia_ocupacional_ergonomia.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_off00006977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 5108 bytes
SHA-256: 25b0ecaa9086b590de2996ff3b82691773d3942eaf1c11b83001fe76b3ec1017
font_01_sfnt_off00007aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 10524 bytes
SHA-256: 3ac8177c17cef085a06ec710f50b6a92bed58ae50c9e6d64ae068c5ea7ecdc21