Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b7cb66b7d00e37…

MALICIOUS

PDF

39.4 KB Created: 2020-08-23 02:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3a87447c64ba99028d853d4a59356cf3 SHA-1: 361271b0b0cffaba6b004b8419692a1fa045afb1 SHA-256: e3b7cb66b7d00e37a1fd5f851650fbb202bf36823b9d0e6d52d29af4442f3dd1
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.ru/pify?keyword=vidmate+app+for+pc+windows+10 In PDF document text
    • http://files.gillianlakethompson.com/uploads/1/3/0/7/130738569/1015e0c63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/27638317894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/tosos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/development_economics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/easy_way_to_learn_english_grammar_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/action_research_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2895/3763/files/19200887262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2524/3039/files/masuvusid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/3d_max_tutorials_in_urdu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4021/6987/files/grammar_articles_worksheet_for_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.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_off00005c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 5520 bytes
SHA-256: c336dd05f332ccfecdf3b5ad755e472c6e9c05f8fc4197872a6d517f00a2cb78
font_01_sfnt_off00006f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 10040 bytes
SHA-256: 588610e66029ebc0b7943e4122d86210b17fe4942379f0dc5609e16e83596705

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