Malicious PDF — malware analysis report

Static analysis result for SHA-256 0781cae515ef48ae…

MALICIOUS

PDF

59.4 KB Created: 2020-08-01 18:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a909ed0d8df65965c3ffe74723d82b46 SHA-1: f849216ef86f2d93bbee7b81d8e75049a990b069 SHA-256: 0781cae515ef48ae5476099b4261994fa678365b65a1d19bfa652455e8d92ca8
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'ftb server commands', and the presence of numerous external PDF links indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=ftb+server+commands
    • http://files.hordlevoluntarycare.org/uploads/1/3/1/4/131438195/padajagow_posugigovagiweb_jigutabinuwe_fuzeganiw.pdf
    • http://files.asim-lab.com/uploads/1/3/1/1/131164431/da299ad5ba071.pdf
    • http://files.crossroadscommunicationsgroup.com/uploads/1/3/1/4/131454634/kuxezodum.pdf
    • http://files.juliedanho.com/uploads/1/3/1/3/131381605/xifosolij_ralajijojazan_zabano_gobamubakesav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/dijamiririlowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/joguduv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/59537258763.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/buluzunasawabezajupofozil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/xaxivenit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/88521998714.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/63883931636.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/jasudoxoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/31956045750.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/62538557672.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/rolibesimorozopozo.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_off0000ab1e.bin
8758f590cf451fa729946884f4d1b932a38a53d263d4c0ec949d1d3a5e164f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1E 5208 bytes
font_01_sfnt_off0000bcc1.bin
15f4cfbd1e7b3a92289dcd7a91fcdd23e182433564fcd9f55a1a5eeb90e2c53e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC1 10532 bytes

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