Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c02398b673b3e8…

MALICIOUS

PDF

48.3 KB Created: 2020-08-03 09:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19dae5af3ede58fec24ab8e28f97fac9 SHA-1: e9f21f44b13b83d1b7ed30190fe400d5523bfe36 SHA-256: f1c02398b673b3e853810ffb6ffc010e08472567821083c023ad55a08d088f6c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=paint+tool+sai+brushes+download', suggesting a lure to download software. The presence of numerous other PDF links, many hosted on shopify.com with numeric slugs, indicates a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=paint+tool+sai+brushes+download
    • http://files.lilgailsllc.com/uploads/1/3/2/8/132816096/piwoxututumixe.pdf
    • http://files.biesebroek.eu/uploads/1/3/0/7/130739101/83e9c77.pdf
    • http://files.youngbrothersacademy.org/uploads/1/3/1/3/131379409/xelubotekupifugepu.pdf
    • http://files.clawspawsetc.com/uploads/1/3/1/3/131398526/sadozegafenanulog.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/41974354742.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/xutebusikelanifixaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/0021/5190/files/78917357355.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/43977918681.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/omfo_magic_mamaliga.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/97559550963.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/73733029270.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/fobetamapijikunanoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/dojulusezakupetewiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/jaradonodipajigolinam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/liwatetipuxufozimewajapen.pdf
    • https://cdn.shopify.com/s/files/1/0436/3537/6281/files/89814776688.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_off00007fb2.bin
80808038fb7fc512ab5cf149f5b68b65e5dfc5501b234bc2524fb711a5515c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB2 5148 bytes
font_01_sfnt_off00009135.bin
66d13d62a63c7089224cf780bf8eac8f6a71be742a1e954f62c80ddafbc659c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9135 10376 bytes

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