Malicious PDF — malware analysis report

Static analysis result for SHA-256 e280c9f461c91e8a…

MALICIOUS

PDF

71.3 KB Created: 2020-10-27 21:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5406b6e165fb497a0e1cc590a0959b74 SHA-1: 2eb5bba8630b15b84dfb5e14d3f05ff29f5a2530 SHA-256: e280c9f461c91e8ae6c1490303f0b2823269590087b40f8775ce5e43416cf2b4
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with the primary redirector URL being https://gettraff.ru/strik?keyword=stuart+hall+reader. The document body, though heavily obfuscated, contains this same URL, suggesting it is the intended destination. The presence of numerous PDF links points towards an attempt to generate traffic or distribute further malicious content.

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://gettraff.ru/strik?keyword=stuart+hall+reader In PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/tewovowixatikol.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/9c8a683c19e.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/2615435.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/vinaruzipetaso.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/edbce265d9.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/1/0432/3845/7504/files/sutijojigoxutigugaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7208/5926/files/92711284398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/bullish_and_bearish_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/bujapekafavibimixar.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/87527659368.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/befewagarime.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/kozuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/geluvilexusomote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6f2fc4-e427-48f1-9aac-f7e130b7605e/95313767700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be6456d-783a-4ce2-ac01-944083ca79c1/73244839317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7878c491-37bc-42ae-b82e-703a71700f0e/gmail_send_without_sharing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b98c1a-6309-41cf-821f-1e617555cfcd/semiologia_medica_y_tecnica_exploratoria_suros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e437067e-395c-4034-ad7b-b286c1f87720/rexepuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/gym_jones_fundamentals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3038/7605/files/happy_madison_productions_films_produced.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6542/4021/files/android_constraintlayout_layoutparams_programmatically.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4037/4436/files/outlook_for_android_not_loading_emails.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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 4836 bytes
SHA-256: 33c7fbf2e84c86dffd41035f5d52d217d236c8d7ad89a5a62da2c8c28b12a07e
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 11372 bytes
SHA-256: c9fd878a679cc77a52e6287baf1c2832d64c3d16cc3ebad7c4345f5444cd2858