Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8f37ec4dbb4610…

MALICIOUS

PDF

48.6 KB Created: 2020-11-09 04:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0322cd814b251b40e190b89da438e147 SHA-1: 4b71d11307af181aa7d68194ffd29f9d5cb3658b SHA-256: 7b8f37ec4dbb46101a2b450515fe0bba5640a4416bdac1b724f7b988015626b6
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://traffmen.ru/aws?keyword=mockingbird+don+t+sing+song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fa339a652e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_5fa890869d167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f9536acd9ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/marvel_contest_of_champions_cheats_iphone.pdfIn PDF document text
    • https://pizaxajejodu.files.wordpress.com/2020/11/62336596416.pdfIn PDF document text
    • https://bukoxeluje.files.wordpress.com/2020/11/maths_book_for_class_10_federal_board.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/zewiwi.pdfIn PDF document text
    • https://wakijixebe.files.wordpress.com/2020/11/aha_bls_test_version_a_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/monsters_by_cr_pathfinder.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/king_of_bandit_jing_episode_1.pdfIn PDF document text
    • https://dapiwifi.files.wordpress.com/2020/11/advanced_heat_and_mass_transfer.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/94990141680.pdfIn PDF document text
    • https://tirutijupez.files.wordpress.com/2020/11/lobovomegipizekazerik.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/rodiguwifekuxizele.pdfIn PDF document text
    • https://dabadebidu.files.wordpress.com/2020/11/how_to_cite_songs.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_off00007d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 5072 bytes
SHA-256: 39c032edb30f8fca131d3b75d93a452f8d1f51c25fd6b42c589f7036125a9a3a
font_01_sfnt_off00008eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEE 11520 bytes
SHA-256: f7b7c424add1ad512382f0f521b2007c0b9b49ac206e316892ce4df70cbb09bd

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