Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ec10bc1c7d026b…

MALICIOUS

PDF

50.5 KB Created: 2020-10-26 04:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 599328f7c78fcd00a3523b16a6d45f39 SHA-1: 9f6f5a187dc7d42e17ae29817ac4f196573440b2 SHA-256: 27ec10bc1c7d026bc9433f5de9afb8cc0f4b7d98086e7643b4ceb17d3ced760d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/123?keyword=historia+del+arte+griego+y+romano+pdf`. The document body, though heavily obfuscated, also contains this URL and other links to external PDFs hosted on platforms like Weebly. This suggests the primary purpose is to redirect users to potentially malicious or SEO-abused content.

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/123?keyword=historia+del+arte+griego+y+romano+pdf
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/xalutos.pdf
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/lifagukowubu-muxitedubo-turapizedales-sasamovite.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/zenajopanumuv_lefomabopam.pdf
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/e22694f3a.pdf
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f93b580959fd.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f88f04ab320c.pdf
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f8dfb3344ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f87b406b2c63.pdf
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f9620d411091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fajeloninesitel/juvetemubawe.pdf
    • https://s3.amazonaws.com/mejigavukolu/georgicas_virgilio_gredos.pdf
    • https://s3.amazonaws.com/fejenijovekozu/xotidunaloboga.pdf
    • https://s3.amazonaws.com/wekibik/taragejuxijatevaxowefuto.pdf
    • https://s3.amazonaws.com/gebukil/49388805857.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/zemurewovis.pdf
    • https://cdn.shopify.com/s/files/1/0506/4251/8166/files/jrummy_root_browser_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0480/4113/2191/files/jasatojezesimilovibag.pdf
    • https://cdn.shopify.com/s/files/1/0482/1362/2936/files/danobefuwa.pdf
    • https://cdn.shopify.com/s/files/1/0268/6903/9296/files/el_materialismo_histerico_descarga.pdf
    • https://cdn.shopify.com/s/files/1/0266/8203/2308/files/castor_oil_for_eczema_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/togetavalavolosadipewuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/piwob.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/jurnal_strongyloides_stercoralis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000774e.bin
8b2a8712526d51def945e262078785676274013a8aadce7d0524934c1e2c6da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774E 5212 bytes
font_01_sfnt_off000088f0.bin
2ca8f5d3e90d76c61d8b0981615fbe6451cbc0e633e0a345e2dd13e6a5e17e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F0 10932 bytes
font_02_sfnt_off0000ac6c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6C 4324 bytes

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