Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c37e1513a2ac3d6…

MALICIOUS

PDF

52.7 KB Created: 2020-10-25 19:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b449b270f270b1eb731bb9e3cc3f1253 SHA-1: e3c8033fb5fc8afa5b831e3052d391ba7dbf7d90 SHA-256: 7c37e1513a2ac3d6ee8e8a1f7ed8fbb235d342bf28074c6a2d413bd694b42650
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One of the initial URLs, 'https://gettraff.ru/aws?keyword=cadena+y+piramide+alimenticia+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam operation designed to drive traffic to potentially malicious or unwanted content.

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://gettraff.ru/aws?keyword=cadena+y+piramide+alimenticia+pdf In PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/1680053.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/mezegaliza-mimet-gukilomodekaje-vaxibopekexiti.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/tivovesipazag.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/sesupu-xozuludofivepur-vebuba.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/ab9786ce00.pdfIn PDF document text
    • https://kalodobig.weebly.com/uploads/1/3/4/4/134432105/fofesesotez-jimepenad-zulemebo-lidirisofex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/164af6cb-5342-48b5-8bec-b5c9c0883ab1/76532228829.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/26945049225.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/gotozogofexigaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/24075297623.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/materi_barisan_dan_deret.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/vuxudavavunurokuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3146/8453/files/xapafajigirupakige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4683/8167/files/pebat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae090fd9-d0af-445e-9c66-e7f3030c00c1/rapport_dtonnement_exemple_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db96c362-c3a2-46cf-a073-04303675a106/53196830575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23704bf1-d18f-43a6-b62c-04f2f434cdf6/difference_between_illegal_and_legal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3798ddf3-e17d-4c8c-a8a1-31b5ca2cbc2b/mefalojofunowetogoxaf.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_off00008cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC2 5132 bytes
SHA-256: 394306b030a1aef3df7a3eeffbab57a7268283420066b3065e1c0cbe6fd2ae4f
font_01_sfnt_off00009e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E25 11624 bytes
SHA-256: 2fc3656cfbf6a84f622e882cf0af1dc0b67d5b47f1878cb7ec8328227857fd1e

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