Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85d2a8d81c971f6…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 10:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 392b19fc6643530f2ab762836af0b582 SHA-1: 247913a4a2baa6575cdaea42d2d31c11231682f3 SHA-256: a85d2a8d81c971f6d74c6346f23e54dab795f1385339944ce30d7455468594c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious sites. The document body, though heavily obfuscated, contains this URL and other embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.cc/pify?keyword=laurentide+ice+sheet+effect+on+river+drainage
    • http://files.johnson-family-chiropractic.com/uploads/1/3/2/7/132712129/vunawuta.pdf
    • http://wenakedun.piggeriesfurniture.com/uploads/1/3/0/7/130776008/bimibasabok.pdf
    • http://files.littleredfoxcosplay.com/uploads/1/3/1/3/131380316/c392eb3371.pdf
    • http://xuzutapip.jodymorse.com/uploads/1/3/0/8/130874493/f2024.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/papikorijej.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/wigaxiputuxemaxaxezewido.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/65679494107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0433/7991/6967/files/48725997226.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/look_over_my_shoulder.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/87599906700.pdf
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/lorikofasofilus.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/descargar_libro_por_tu_amor_3msc_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/xopuvejewimosalaxa.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_off000066a3.bin
beda3d445e86701806157a31d505d42f46d6fe4ccc1bb2e0fa33d35a80f2fb19
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5252 bytes
font_01_sfnt_off0000787f.bin
a8b5f693fa6d6cf794096b24b99f82b4983f34d34333e6debab6ba8ab947c9fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 10340 bytes