Malicious PDF — malware analysis report

Static analysis result for SHA-256 323bb8b4693b0b8d…

MALICIOUS

PDF

42.4 KB Created: 2020-10-03 19:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7a60484df0db1ae9df067fdd384748c3 SHA-1: 4d7af40e55465fc803c48e370ad26d9c4af61034 SHA-256: 323bb8b4693b0b8d390613e0be7b45d80854e4f100e698489d31fd9b0668fa0d
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Aster clinic lab reports online' and a URL that appears to be part of a link farm designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=aster+clinic+lab+reports+online In PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/sujajomek.pdfIn PDF document text
    • https://site-1039150.mozfiles.com/files/1039150/tixopulokiromamamen.pdfIn PDF document text
    • https://site-1039350.mozfiles.com/files/1039350/xuminone.pdfIn PDF document text
    • https://site-1042284.mozfiles.com/files/1042284/serejitowukikuwibasowab.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/kikimikexezumaruxex.pdfIn PDF document text
    • http://devagibu.ritacousins.com/uploads/1/3/0/7/130740368/6b7a72.pdfIn PDF document text
    • http://files.rosnyspringboard.org/uploads/1/3/0/9/130969160/7543630.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://uploads.strikinglycdn.com/files/42f403b9-9458-4ff6-b8e5-ec1a711cb60c/73292349748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/kademowerufovevuvuruguf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/50828108411.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 4844 bytes
SHA-256: b9f23b3c40f5401f52ed78177a644c5e96c321ae8a5d95ab657edcc063b02a55
font_01_sfnt_off0000717f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717F 9964 bytes
SHA-256: d7deabeb6f110afbba6ffdd61626c5d5227862a47fbce8f9327843e5ba73af78
font_02_sfnt_off00009381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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