Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc5640147f0fad0…

MALICIOUS

PDF

40.8 KB Created: 2020-11-08 12:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a35fc810e5fba96feefbc9a2065604d0 SHA-1: 1b3b02e7e2ee9845d1f55d628e789c8807d14c01 SHA-256: 1cc5640147f0fad038d3ed26876b0c1e3cac64a008b1c271a4fadf43e5e4818a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a heuristic firing for a link farm, suggesting it's designed to host numerous external links. One prominent URL, 'https://trafftec.ru/aws?keyword=walmart+receipts+app', is embedded and presented as a search result lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. Although no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links, likely leading to further compromise.

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://trafftec.ru/aws?keyword=walmart+receipts+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f948fa2bebfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f95e7ef3b066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fa22cc4e3722.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/25f9a09f-0538-462a-bfb3-ff7a25061915/fallout_4_romance_curie.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/visejaxanujopisaveradobe.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/nothing_but_the_truth_chapter_11.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/trumpet_tune_henry_purcell.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/modern_world_history_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/47466789914.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/circle_of_fifths_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/xulisekobijexodova.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/83865975580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e502d0-8bb7-4c00-9e9f-1a899fd8b804/97854746851.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/munuzaragujilupipazabik.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_off000061cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 5092 bytes
SHA-256: 64d65baf01af016305eb327dfb5001964b313e6650caf764142455b15d04f303
font_01_sfnt_off00007310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 10524 bytes
SHA-256: 31c7f3675c2906f99ecb41bf4554e80e0a1664cf382215bd8f2bd0e7fa0a2579

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