Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e6238833d9ffd3…

MALICIOUS

PDF

41.6 KB Created: 2020-08-13 08:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8166df1b85a10613f34e3a62a7a4136e SHA-1: 9f1a4fda0c5a6f61684c08bf1297e6e9e39cf0e0 SHA-256: 16e6238833d9ffd3fa35a360c0670140592897a409769058f44bf2c9a1df2870
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to a malicious URL, specifically 'https://ttraff.ru/wb?keyword=rosanna%20toto%20guitar%20pdf'. This technique is often used to obscure the final malicious destination and potentially for SEO manipulation to improve search engine ranking for malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

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 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.
  • 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=rosanna%20toto%20guitar%20pdf
    • http://files.bossmomlife.club/uploads/1/3/1/4/131438448/vezefexoma_putuxagemu.pdf
    • http://files.philologia178.org/uploads/1/3/2/3/132302759/disunobegotanelubo.pdf
    • http://files.manupagainstbullying.org/uploads/1/3/0/8/130813988/sezumikofelofuzazaw.pdf
    • http://files.msmerg.com/uploads/1/3/2/7/132740239/bukose_suwovir.pdf
    • http://files.joyfulartstudio.org/uploads/1/3/2/3/132303068/liluvikidixugo_fuzoweka_zelevilevivi_lovarobad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4014/4534/files/96408374995.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/56251548169.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/lightning_crashes_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/bojapogodomelafanazuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7978/files/16816468102.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/87924807913.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/towukesilamuvonebulutajan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/holt_world_history_ancient_civilizations_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/51330675035.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/67516546450.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/becoming_a_better_husband.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_off00005a18.bin
eb4a38127b031b43faa3f4b47b7faee7b1fe867246a948d978fbb5c723b5628d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A18 5184 bytes
font_01_sfnt_off00006bcc.bin
fe7bb4dbb7c037c70052a40a9c016800d4ed9e93757986746fb5eece20ccd841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 14708 bytes

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