Malicious PDF — malware analysis report

Static analysis result for SHA-256 8165b49e5809a960…

MALICIOUS

PDF

42.0 KB Created: 2020-11-07 00:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5a0bcc7a88fe888a09eab597f1295931 SHA-1: c76d067c5d3f9535b9dba866e3c11bb5692ae76c SHA-256: 8165b49e5809a9609db854a2453397f9f486d1126c53a0c8bed40ee94553d8be
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://traffnew.ru/aws?keyword=growing+growing+growing+test', suggests a keyword-based redirection or content delivery mechanism. While no scripts were extracted, the sheer volume of links and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?keyword=growing+growing+growing+test PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tagorarib/43902831518.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/karebow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139284ea-4b9a-42b7-a32b-251aeebcf8a8/15745059084.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/37984971875.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/javavageximelibirokazo.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/bodybuilding_free_workout_plans.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/fp_on_illinois_license_plate.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/advertising_management_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48517964-4525-4648-8f58-37e5f8780103/mazinosapabukumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1047e74-9c0c-4272-a802-b65b1269c8e8/rival_automatic_steamer_4450_manual.pdfIn PDF document text
    • https://wisunin.files.wordpress.com/2020/11/zimebigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/11531173825.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_off00006765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 4736 bytes
SHA-256: de62f04de76f8c574f7297564ddf2c99ba62234676271684314f2d782ff578f5
font_01_sfnt_off000077ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AE 10488 bytes
SHA-256: 01ac01a63871132a2eac7432811c8fdd1e41204942a29e36f46f4c07145c1814

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