Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2f72d70bfd0e66…

MALICIOUS

PDF

45.6 KB Created: 2020-11-03 21:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff2b66f34c231261883c6c024251bcbe SHA-1: 908355c856a7af1b47260cf0e8421f5e70e45073 SHA-256: 3f2f72d70bfd0e6698e67c2a4adc47e56840920958519f3fd35e89770202741d
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains references to a "compound interest worksheet excel" and includes URLs that are part of a link farm on disposable hosting. This suggests the document is designed to trick users into visiting malicious sites, likely for phishing or to download further malware.

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 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://ggtraff.ru/aws?keyword=compound+interest+worksheet+excel In PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/limekawavuv-fukif.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/78f7b7ac897d.pdfIn PDF document text
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/gofiwuwaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f924d087cd9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f87e550a7816.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/23440f2.pdfIn PDF document text
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/bf343a17345b3.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/figasivumo.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/gizebopisofu.pdfIn PDF document text
    • https://garigewofunem.weebly.com/uploads/1/3/4/3/134314314/dexosegivedobu-resujijaxuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/juvunikumon.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/35451818877.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/teachers_day_speech_in_telugu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/45599802912.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/nulomo.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/connectors_list_with_examples.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_off00007284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7284 5232 bytes
SHA-256: 88ac82f7c652547c5ed5a28bb93687c49e124f39fc64c6fab2a859f1181cf2c2
font_01_sfnt_off00008436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8436 11100 bytes
SHA-256: 40333a6848c8942c34b9dc7ed690a45ae235c4d6ee823f7bfb33e869068828e0

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