Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990819cd7b2ac08…

MALICIOUS

PDF

54.1 KB Created: 2020-11-08 00:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b196956809a991e2bc758087bb96e252 SHA-1: 782d95f977ca49465d647e51f0ff77595e8e72af SHA-256: a990819cd7b2ac08b69a016f40e50c0f4f7085b594a8a368ee9e8c7133aedcab
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Mr. Chang' and includes the same suspicious URL. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=mr+chang+stream
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fa2626f0f954.pdf
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5f8d9de7e9043.pdf
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/pabazadosajas.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f88b84cdf92d.pdf
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8b2492b46d4.pdf
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f88cce0c7894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fodabijiwifi.files.wordpress.com/2020/11/wadorenizagonuvavufo.pdf
    • https://uploads.strikinglycdn.com/files/c0c58436-0794-4e07-8f06-0cb4e4b790ec/39376882407.pdf
    • https://uploads.strikinglycdn.com/files/5340fb84-c9fe-4abe-80b6-82b13ad227e0/11718704848.pdf
    • https://lafukoruza.files.wordpress.com/2020/11/she27s_the_man_full_movie_123movies.pdf
    • https://uploads.strikinglycdn.com/files/ddfad752-bb6e-4b6e-9cad-7f85a473afdd/42141219233.pdf
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdf
    • https://uploads.strikinglycdn.com/files/12d336a4-5e00-4533-ae91-3e47f4cf72ca/13221075879.pdf
    • https://zulomilo.files.wordpress.com/2020/11/44114612246.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_off000093ec.bin
3e7d9994540590750521840086f3fa6080b4b52d0ab098626a2e0df03da59048
pdf-font-stream PDF embedded font (sfnt) at offset 0x93EC 5184 bytes
font_01_sfnt_off0000a573.bin
22051191d4a50333a766c1014c932af8a45ce56984a06d252901c50ae72fb9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xA573 11224 bytes