Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41be506c3db997b…

MALICIOUS

PDF

41.7 KB Created: 2020-11-09 04:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7e71f92f0442a52332636023d5a3751e SHA-1: ed93087c1dbba5635128e7360deab76f5562d42b SHA-256: a41be506c3db997b4aeac0327773609060c6dbb789e93f400ba8061403663c2f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to redirectors and SEO farms, suggesting a phishing or scam attempt to drive traffic to malicious sites. The presence of the 'Eight ball pool app' in the document body and URLs indicates a lure for users interested in games. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/aws?keyword=eight+ball+pool+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f87d4dce466d.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/lekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f99197f2f228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fa6022ca0902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5fa113d7959f1.pdfIn PDF document text
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/muvila.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/fidefofudi/85028238390.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/english_vocabulary_test_papers_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc74421b-22fe-4bc0-a2e1-939af2fc6a96/61877666759.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/jumujowogakuxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f363c445-88f8-4721-b3fc-a605121578b4/zasezumulag.pdfIn PDF document text
    • https://kasujakomo.files.wordpress.com/2020/11/8671079407.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/76002794562.pdfIn PDF document text
    • https://kuzosetaz812614874.files.wordpress.com/2020/11/black_ops_2_level_hack_pc.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_off000063a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 4904 bytes
SHA-256: 7b7c0998b06ceadceeee8b923992921d98cd47d07b101998874550f016ee3093
font_01_sfnt_off00007457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7457 11684 bytes
SHA-256: b9000206870d7e7d7f7b8049afabdddd10079114417cb7c1d4bb16ac34a26e45

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