Malicious PDF — malware analysis report

Static analysis result for SHA-256 61463b6d7cd83539…

MALICIOUS

PDF

48.5 KB Created: 2020-08-06 21:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54536cf2f8c82a4543f79a8a448177a3 SHA-1: ff3e5e339d4ef32cbd81d95118bf300a6cfbde87 SHA-256: 61463b6d7cd835390d8fe868a8d002894df7ebce5db96074cc568aac9576c2c4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to appear as legitimate PDF documents. One critical heuristic indicates a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=benim+hocam+kpss+matematik+konu+anlat%25C4%25B1m%25C4%25B1+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs suggest a phishing or SEO poisoning attack.

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.com/pify?keyword=benim+hocam+kpss+matematik+konu+anlat%25C4%25B1m%25C4%25B1+pdf
    • http://files.easttexascanopy.com/uploads/1/3/0/7/130776407/wutik.pdf
    • http://files.newwoodfordhs.com/uploads/1/3/2/3/132303035/63272e63d73c.pdf
    • http://files.vzwierphotography.com/uploads/1/3/0/7/130738534/nebefatosezakodoke.pdf
    • http://files.dewdropsperch.com/uploads/1/3/1/6/131637385/letaz-senukabuwalibin-domok.pdf
    • http://files.msm-missions.com/uploads/1/3/1/8/131856574/2278341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/muxutufigiraxarix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/56622582978.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/40299795425.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/48081311111.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/repofizup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0807/files/16011759656.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/43018303042.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/candlestick_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/pizurafoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/zozitadimifel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8969/files/kisovaropavaxun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005439.bin
0559fac7c24a50d0df2077cc7acf63d084360f7d2f3cf27a6185207224c1ce97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5439 5444 bytes
font_01_sfnt_off00006693.bin
8d7e33d5e3bb495e1b99690e65a4c2d5cf9408226aeb63292ef3b4fdca7bd11b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 4284 bytes
font_02_sfnt_off00007217.bin
9c50a6c898a3aba1973a0bbc5bd2a339c9c6870cea90b17d173d16a60f50e9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 11944 bytes
font_03_sfnt_off00009751.bin
8fcd9a56036b50d77bb79000595de8be5fa8d30d538a7baf7b04873f12d3e927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9751 17604 bytes

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