Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdda429cc056831…

MALICIOUS

PDF

51.7 KB Created: 2020-10-26 21:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 399ee075ec4123592cdaff6de152f100 SHA-1: 31769690c030ae38b0dba9db8439e6e933b623de SHA-256: 5fdda429cc056831165e59eb64d37a4309119a6dc364d3acb67229064ee55a9a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=mcmush+lab+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f956e8fe3793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f928e3949cc9.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/1/0500/1415/9040/files/nazinudezomuminanodexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8494/9920/files/pioneer_avic_d3_installation_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6153/7689/files/last_day_rules_survival_ios_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0678/5430/files/kirewuvebowizatuxiriton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2960/1178/files/merge_dragons_mod_apk_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/sublime_with_rome_tour_dates_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/naruto_shippuden_filler_arc_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/28159739887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/joniravefunetawake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6304/9879/files/clash_of_clans_cheat_gems_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff15df13-bda3-41b2-8b42-e1a245dfa00e/fogabogosidalisore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0095eb-74b5-42d8-9237-3273115a21fb/bigopapofixowodivaza.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/37876165180.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/balasevic_knjiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532cfcd2-980e-47bb-b4d4-d226478d72ca/12402830713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f79ea4-95b0-4c3d-8b69-6e81ef69cdcf/diego_rivera_lesson_plans.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6725 5440 bytes
SHA-256: 3e420721870c66d0b77105afa44bbc1cb7a5bb73d538c433d4ccdc63d7da1e2c
font_01_sfnt_off0000799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10328 bytes
SHA-256: 9af46b756dfcaa9165909119086e781568342cc63554aeb7d5cd18cf49dfa2a6
font_02_sfnt_off00009cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBC 22400 bytes
SHA-256: 3a00863630c9c37d8a0e9f641160656e97e9b413b8ea9a7e59e3876df6763a53

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