Malicious PDF — malware analysis report

Static analysis result for SHA-256 497ed2b7e7632f79…

MALICIOUS

PDF

139.9 KB Created: 2020-10-01 18:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0d24ab32133a24a3c77b84cc10c30a5f SHA-1: 0ca9c5b85b80f285cb44660904f6d6f4b2760548 SHA-256: 497ed2b7e7632f793501d94e20496ff32c5ab31181b3997fa4c19eef461788b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to appear as a search result for educational materials. The ML classifier strongly indicates maliciousness, and the PDF is flagged as a redirector link. While no scripts were explicitly extracted, the structure and heuristics suggest an attempt to deliver a payload or phish for credentials via the linked URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/strik?keyword=grade+7+math+module+teacher%2527+s+guide+pdf In PDF document text
    • http://files.nakayamaus.com/uploads/1/3/1/8/131856624/2274337.pdfIn PDF document text
    • http://wawap.topdogracing.com/uploads/1/3/1/6/131606490/6993500.pdfIn PDF document text
    • http://meligusig.jennmconway.com/uploads/1/3/1/4/131453486/eeec87d0aae.pdfIn PDF document text
    • http://libim.arborsenior.com/uploads/1/3/1/8/131858530/mewaxepebi.pdfIn PDF document text
    • https://site-1038382.mozfiles.com/files/1038382/61245060042.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/58180040641.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/jukavitejovozisikavi.pdfIn PDF document text
    • https://site-1040104.mozfiles.com/files/1040104/38173122381.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0427/5005/0460/files/cnn_10_january_15_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6726/4164/files/vewadugesowilazusuluga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8432/4504/files/95941520021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4262/3647/files/9th_grade_spelling_words_with_definitions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/workplace_inspection_checklist_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/hurricane_high_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8846/5051/files/microwave_transformer_voltage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3337/4115/files/joworavavigewumozemafimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9231/0693/files/nejefoki.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEE8 9400 bytes
SHA-256: 631b1af22fd34142cfea6233935634252487bd72de2e79aef067525fa9c264de
font_01_sfnt_off0001c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86F 5712 bytes
SHA-256: 07bb48701e8e222375587c32805542a119af2a5365f63429f28d0318ec46b7fa
font_02_sfnt_off0001db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB8B 6300 bytes
SHA-256: fba9f6d5d467b7d6bbccdc8ac95b73ea8a6825a62cfb156e50cd914bb525142d
font_03_sfnt_off0001eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EADC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_04_sfnt_off0001f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F36A 14104 bytes
SHA-256: b25ce736975ff0029365cecec1a3af562c991d8752efc69ace4846f344fa2774

Open this report in the interactive analyzer, or submit your own file for analysis.