Malicious PDF — malware analysis report

Static analysis result for SHA-256 30377aac9d3e47b0…

MALICIOUS

PDF

57.3 KB Created: 2020-08-18 15:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c056c8adc4a004bfbe7170a4635edd7c SHA-1: b13a96c30752a29f567dd057a2686aec5b116a27 SHA-256: 30377aac9d3e47b0511004614cb3777f7285053cda8e44112c0da3ea8f167ffb
202 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/pify?keyword=calculating+gpa+worksheet+high+school In PDF document text
    • http://files.mezohenley.co.uk/uploads/1/3/1/3/131383651/sesosajaf-munezetub.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/1/0429/9456/5271/files/how_to_craft_shield_in_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/fimofuvuxozetuzizoziz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9083/7655/files/canzoniere_accordi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/length_of_string_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/junuvumagojaxulebuzor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/caritas_in_veritate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0528/files/deep_impact_full_movie_720p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/autodesk_design_review_save_as.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/rudadoveketakozupesuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/auto_call_recording_folder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/zimumokajuvurinisusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/japanese_calendar_2020.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_off00009904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9904 5256 bytes
SHA-256: 0a9601a39cd7f8f7b3f4071c2026d11975a63340e38cac6ab81bb78b9ea0f3e2
font_01_sfnt_off0000aaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEF 14464 bytes
SHA-256: 2f24a132b454511adb023232fcdc767fa47581d650bc50557f7ee854db112690

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