Malicious PDF — malware analysis report

Static analysis result for SHA-256 579cd8b0475d0a17…

MALICIOUS

PDF

48.4 KB Created: 2020-07-14 03:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8691a9fe732ad2a9fd18689f978c633 SHA-1: 9001814e8ad36f225ddaeb3ea65fa8e34ee1b9b1 SHA-256: 579cd8b0475d0a178815c9700b1e9ef11934ff46f408ee662c2d4405d060d627
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=portafolio%20creativo%20pdf'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, with the first being 'https://kunaganit.files.wordpress.com/2020/06/detamupuwox.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, preventing analysis of its direct content, but the presence of these malicious links strongly suggests a lure for further malicious activity.

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=portafolio%20creativo%20pdf
    • http://files.banksminiaturehorsefarm.com/uploads/1/3/0/7/130775396/wiwaxade.pdf
    • http://files.kafyeblaan.com/uploads/1/3/1/8/131856381/becb5.pdf
    • http://files.illinoisdelta.org/uploads/1/3/2/6/132681938/2186787.pdf
    • http://files.ninamariegardner.com/uploads/1/3/1/4/131406105/dizofu.pdf
    • http://files.ninamariegardner.com/uploads/1/3/1/4/131406105
    • https://kunaganit.files.wordpress.com/2020/06/detamupuwox.pdf
    • https://nonetesafovo.files.wordpress.com/2020/06/dedamedaweziwozemi.pdf
    • https://mapoxadip.files.wordpress.com/2020/06/mosibivotijebiweni.pdf
    • https://jopojeri.files.wordpress.com/2020/06/75746357043.pdf
    • https://wupefosa.files.wordpress.com/2020/06/wuvaduxokumanalepesaj.pdf
    • https://forenuxi.files.wordpress.com/2020/06/diligupupimotupiparid.pdf
    • https://larifite.files.wordpress.com/2020/06/40920504167.pdf
    • https://lorirosoxaxe.files.wordpress.com/2020/07/panaralogefusogawo.pdf
    • https://batamoxekopu.files.wordpress.com/2020/07/bexusazojipisuvikomiderol.pdf
    • https://mojilil.files.wordpress.com/2020/07/xamisafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/gilunanovogogavuwojarejes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/23754914773.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/48844383709.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/85292211116.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/14354607751.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec5.bin
7bf14fda30340cd8e33c792ef22313d9df663d3be01849e072a53f19a18333c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC5 4712 bytes
font_01_sfnt_off00008ed8.bin
4a112c84ca6305e372b8189568efe926557ca2d90a1aa0d13512371f535bfb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED8 11540 bytes

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