Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f4f918d483296e…

MALICIOUS

PDF

45.9 KB Created: 2020-10-30 22:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e95d783b37c2a68fab2defe5ba61a7d SHA-1: dbc2bfb40f082ae01dfe0d52296964587617c928 SHA-256: 31f4f918d483296e3bda3ca211479dd97e270c49ca2efa370802350a26ca0973
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=when+does+the+super+bowl+end+pacific+time In PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/jaruziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f86f5ea91ce4.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/wasalekesetowaz_wowajigotujas_medufexapisop_tugofuseba.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/91da0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vufupu/61026313189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cae7d2-c26a-4943-a5c0-18fbb5f44742/tunipojamulomomelub.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/tubitobotarejugumegu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/loksatta_epaper_pune_today_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/61262208006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ee34ca-8987-4f68-8c72-b07c5a030b36/709913056.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/63798821942.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/62761540750.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_off000063f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 5520 bytes
SHA-256: cf5626cc94e1d7f99957ddb3d53fdfe0f6428caad8312d8b103c7e0a5850c4ed
font_01_sfnt_off00007695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 11080 bytes
SHA-256: edf2a853131135a833c1a5c16a6847dabfa280bc364ec9bbbfb421d34cd6a696
font_02_sfnt_off00009c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C57 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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