Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f9c32c746987d4…

MALICIOUS

PDF

38.3 KB Created: 2020-08-23 10:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3daebf7f18059ea395dc61aa85e6c83 SHA-1: ae82224fb47d8c851bd55c3bdd3072a87586913e SHA-256: 19f9c32c746987d4fd0f9f5476bedc62abcfeb2b302dfb5445b9602997d82ec8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector (ttraff.ru). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, many hosted on Shopify, suggesting an attempt to obscure the true destination or leverage legitimate platforms for distribution. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=sustainability+reporting+sector', likely serves as the initial lure, redirecting to further malicious 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/pify?keyword=sustainability+reporting+sector
    • http://bekisav.glassmermaids.com/uploads/1/3/1/3/131398406/d9d23.pdf
    • http://files.convectionery.co.uk/uploads/1/3/0/7/130738765/997050.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/xonazipufefobovetiwemepeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/77405594445.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/93089204528.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9647/files/zotuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/chuuk_airport_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/suwebelenezegatunilade.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/cantos_para_misas_espirituales.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4509/files/jazusutaburejupenopideki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/govedamikeledu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/86775164500.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/dupawamosasidulapijipavux.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_off0000581c.bin
8dc80c2375e8346019d4566d5bcb341ceb999e5def155d75bd43a91de363954b
pdf-font-stream PDF embedded font (sfnt) at offset 0x581C 5444 bytes
font_01_sfnt_off00006aa9.bin
1fd47bbd906a1b81a4c93a6ab054c6063e87fdf8dd7775f3a3742df4803ad85d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA9 10012 bytes