Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f536febbd2887…

MALICIOUS

PDF

41.1 KB Created: 2020-11-07 19:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 178e4276f6c8a807748484951c3b10d6 SHA-1: f6f2ecabba38219a37e9c832bc46d00b006793d1 SHA-256: ab3f536febbd2887dbab79b93e6a9c3f3f1b0589f2a9e46852704daefef6dfcc
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://traffine.ru/123?keyword=the+second+lady+lannister In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fa35b38706ca.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/81978dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f8fe3aba961a.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/vubofinemomuru.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/63a0cb90-0fe2-4d19-9cca-caac8f3fc00e/fexotaxojiroweketejuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc22f86d-8165-438a-867b-e71b1690e09a/towizupikidewat.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/gunblood_game_2_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a1dd9c-16ff-40d4-a4c5-5fa727d5a927/kavigesuzusasefafa.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/xoluxaxufiwetogunuwelalof.pdfIn PDF document text
    • https://firijidu.files.wordpress.com/2020/11/nijemusejewuwejox.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/34772705040.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/tixadopesipi.pdfIn PDF document text
    • https://sodegiporixo.files.wordpress.com/2020/11/atf_box_setup_12._60.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/antiderivative_worksheet.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_off00006002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 5080 bytes
SHA-256: 88be2d6afb86a1c3be3c8ed60235d29bcc89c60ea9377ea70b6deaf55ce13ac7
font_01_sfnt_off00007147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 11212 bytes
SHA-256: 55f62efb81e814f28ff1c26edff6ff449008a6433da802984af59a6616a60523