Malicious PDF — malware analysis report

Static analysis result for SHA-256 605dcdd3fc3a0f6a…

MALICIOUS

PDF

59.1 KB Created: 2020-08-18 17:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0444d9cd1a4b75194646f4650e229ad8 SHA-1: 3811067d0ff87ef067a720b02944000cc5e1356a SHA-256: 605dcdd3fc3a0f6a5e584a2a7f5e8d4ae34f420b5a09542babbc90a132994c52
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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=job+experience+letter+sample+doc+format In PDF document text
    • http://files.thebarnatheritagefarm.com/uploads/1/3/0/9/130969742/mafinerum-tizevebupug.pdfIn PDF document text
    • http://files.carlingtonchaplaincy.com/uploads/1/3/1/6/131636692/97bc6aceb22.pdfIn PDF document text
    • http://guxedoru.hoggardstudentservices.com/uploads/1/3/0/7/130776257/4ccb475fcc.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/1/0428/7689/5398/files/grievance_procedure_in_the_workplace.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3391/7590/files/bootstrap_templates_responsive_charts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/alberta_separation_agreement_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1432/3356/files/82872982414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5645/7880/files/zomunilufesego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5187/0358/files/internal_capsule_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/31285050434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/whatsapp_for_nokia_216_keypad_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3923/3960/files/17698905801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/turotufizelepedumasik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F99 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0000a993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA993 5496 bytes
SHA-256: 12a73f7f4d60c9117c57f7f1fb827049e8a6b6737b975d0d60b40dd4e6dd569a
font_02_sfnt_off0000bc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC22 10128 bytes
SHA-256: 928c59fc7b2fdc2af9be227e97b374fa9d6f163527e7e081d613f3103ec0e3df

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