Malicious PDF — malware analysis report

Static analysis result for SHA-256 df688577b197c15e…

MALICIOUS

PDF

56.3 KB Created: 2020-09-30 13:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6ba7b87b126c164c60b713d420ec6673 SHA-1: 265a3b69fad82269ec76937098308701b649524e SHA-256: df688577b197c15e817677f8117772d660e037a44aa3de1d805acf89973bfba5
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://cctraff.ru/strik?keyword=basic+electrical+engineering+books+pdf+bangla In PDF document text
    • http://files.rathcorschool.com/uploads/1/3/1/4/131409498/zotemumozot_bogunaxuvaril_fonelazenese_tipam.pdfIn PDF document text
    • http://rulapi.alloexo.studio/uploads/1/3/0/7/130775810/648292b.pdfIn PDF document text
    • http://files.harvestbibleaz.org/uploads/1/3/1/1/131164066/wamixisid.pdfIn PDF document text
    • http://sojutu.anchoragesolutionsinc.com/uploads/1/3/1/4/131406668/bda3f1731a1.pdfIn PDF document text
    • http://paweros.photosbylynnmarie.com/uploads/1/3/1/3/131383721/pifijugakuve_jaxezimizejumof_zevusozajul_nogukixivo.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/1/0437/4432/9877/files/53328771778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/17066463722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18ff3ee-24d4-439c-be91-19af99ef7e8c/runuvoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d6bee3-bdbf-40ea-ab5d-4f38f1047080/sivuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e4eec0-b1c3-455b-b9b9-9e04c6cd09a4/35418983023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0089feac-c0da-456d-ade7-a90cd4efbdb8/dokewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377ccfe5-da1a-499e-b873-9d8197d96c4e/3912782871.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F22 5576 bytes
SHA-256: 640b7da20adf511174afaa89f21de9c2d9c27c261a8b5dd6e6b37d8c1bd75de0
font_01_sfnt_off00009221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9221 9288 bytes
SHA-256: 0e614ab3ec6cf50bf98165be4f8bd42ee86d5200c639602a5855086adc50953d
font_02_sfnt_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 10788 bytes
SHA-256: 32b9f14520f48a7e40ab1fff08255fdf5d0092ad8381b1a82841296f1d79839d

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