Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26aec711c1b7c78…

MALICIOUS

PDF

42.9 KB Created: 2020-10-17 10:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 445ccd9dcc02edb9adffd2b7e0a053b1 SHA-1: a521a7172fb8eb9aad96ab246f5b3add49ca667a SHA-256: d26aec711c1b7c78ef8c91dacf480b2a7d0b322fcaf9841957917cf4cde0c279
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://cctraff.ru/123?keyword=app+espi%25C3%25A3o+android+gratuito In PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/zupuvukasudeviv-tibitavufakexa.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/f2895.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/1a9fb9c6-394c-4be1-b11b-284bb47fad46/47323967661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fec83e1-fb13-4951-9817-5e859b18ac0d/xibifunikadusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8a3299-9a23-4d43-956f-307d253fa7ad/50410914352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a0ff2c-a4cf-434b-9395-165e9c83df73/seguzavaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd71e257-7502-4db0-a5d0-4cb0ac0b30b3/6482785405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac89733-8cd4-4ab0-ad88-43f62501a653/jaluxesajub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cb5db2-794e-477e-90a4-d2059249eb2a/jebusopumilumoxekowemer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875b678f-1016-41ad-b202-92ce2d65ab11/29629023993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19c7172-7a9e-4886-997e-cd20f42ceca1/44278881606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1562c688-7936-49c4-902b-1bbaecef97c2/xazobakivesed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f429e361-6872-462d-93d2-c62ba96bf275/boluriso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a6d434-bf55-4743-bbe9-25db2fc19cbf/gakajijufavawodizad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e790f786-25ba-4533-96dd-d71f67ab978b/6540496150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1580/5349/files/wow_fury_warrior_guide_bfa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4673/1930/files/5131930343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0622/1214/files/yle_test_flyers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4848/7070/files/volume_element_cylindrical_coordinates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2139/7927/files/massachusetts_divorce_record.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_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 5400 bytes
SHA-256: c383998a598ff5a9f0000adb1a78886fa09c71fd0edd9fe20613eccdbd421d53
font_01_sfnt_off000071a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00007a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A35 10148 bytes
SHA-256: 51aca089b82d0e6f7578887561352843e2055474bf3a83d397014d1db05bbd0b