Malicious PDF — malware analysis report

Static analysis result for SHA-256 689fcdaafb66fc4f…

MALICIOUS

PDF

42.6 KB Created: 2020-07-09 17:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aade7536c5b949abd918a315a8947ea SHA-1: a8a21828336a5f08a9a296d5078362f47dcd2551 SHA-256: 689fcdaafb66fc4fc7df7105ab72f3baa9dfffc818d12dbae0718b01625b12a6
162 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files, many of which appear to be SEO spam. One prominent link redirects to a malicious URL, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-linked PDFs points to a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.ru/wb?keyword=opel%20astra%20user%20manual%201997
    • http://files.rasrimarketing.com/uploads/1/3/0/7/130775116/6b8af09500710.pdf
    • http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdf
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://files.kenshukai.net/uploads/1/3/2/6/132681343/totit.pdf
    • http://files.orlandohomeinspectionservices.com/uploads/1/3/1/3/131379085/b0c9680383c.pdf
    • http://files.aliceannephotography.com/uploads/1/3/1/3/131379447/xisejexopore.pdf
    • http://files.woodlandsfrenchies.com/uploads/1/3/1/3/131383553/buvomagedax_dopiriveluk.pdf
    • http://files.weirdartmuseum.com/uploads/1/3/1/4/131407823/980706.pdf
    • http://files.cobblandmarks.com/uploads/1/3/0/8/130813768/turibupadase_kirofivoguw.pdf
    • http://files.tiffinindia.ca/uploads/1/3/1/3/131398066/xubunujake-kosonowuzela-fazapafawefa-dadow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xetawebogov.files.wordpress.com/2020/07/46889961560.pdf
    • https://zojatuwo.files.wordpress.com/2020/07/61540909253.pdf
    • https://gunogosow.files.wordpress.com/2020/07/punufapopupebinup.pdf
    • https://jaxabojewik.files.wordpress.com/2020/07/19485943681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mozinetesabelenigifil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43561311815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90675932679.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000697d.bin
aa0658079398c7682c04af3301d5c8a9f3842856039ae97dd61bbf5609d8c381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697D 5004 bytes
font_01_sfnt_off00007a6f.bin
06e0b86ca47c64d63b7905e40af4f674e8d0c9e3fdfedf73a575af50bb5167f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 10488 bytes

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