Malicious PDF — malware analysis report

Static analysis result for SHA-256 1551e8f4c93c63f7…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 10:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65599891f3dba970289fc06e6e1f1d35 SHA-1: c84bbacecc830bbfe896e16948c7e4b0a339cb36 SHA-256: 1551e8f4c93c63f79bcfc64a1ac6ae221c41c8ff7d47239cf08a33e5c6e773d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm heuristic further suggests an attempt to manipulate search engine results or distribute content via numerous external links.

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=uc+browser+fast++apk+latest+version
    • http://files.nlistudiosla.com/uploads/1/3/1/4/131438038/pabutarirotosara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/phn_mm_chuyn_sang_jpg_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/5642/1269/files/chief_keef_bussin_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/space_engineers_thruster_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/mudejoxovedewisekomujekuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/87795191363.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/87221866370.pdf
    • https://cdn.shopify.com/s/files/1/0429/5881/5398/files/82261980497.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/vb._net_file_from_onedrive.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006232.bin
a28402f46b4f976113f1719e90e7b6241e8a7460a75bec208d951a13a983de50
pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 5356 bytes
font_01_sfnt_off00007492.bin
3d0d339ad4c86835187242891d89567c133ef7c934d9044ed5e4a545fddc58e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7492 14844 bytes
font_02_sfnt_off00009e1d.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1D 16092 bytes