Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb9b6414728891f…

MALICIOUS

PDF

42.7 KB Created: 2020-04-04 08:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9308dda0e123eb80d1b9328493d40510 SHA-1: 2141b5758aec97c18d24f935bc98774972f8e785 SHA-256: 7bb9b6414728891f4464f38d7b1062850fc5ba04bd0138937c455b67284fd9bd
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The embedded content, though heavily obfuscated, appears to contain URLs that are part of this link farm. The primary purpose seems to be directing users to external sites, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://rehabethiopia.com/uploads/1/3/0/7/130775247/130775247.html#kgf+tamil+full+hd+movie+download+tamilrockers
    • http://rutas.in/uploads/1/3/0/8/130813307/fofujawedumidem.pdf
    • http://ronansuess.com/uploads/1/3/0/7/130739392/tilizub_kilatolovuxeb_nefagenov_lodiwafuzolu.pdf
    • http://themfirm.net/uploads/1/3/0/2/130288416/6aab991025.pdf
    • http://newageoflight.com/uploads/1/3/1/3/131383646/zalesuno.pdf
    • http://prettyappblog.com/uploads/1/3/0/2/130289278/jusavowaroku.pdf
    • http://twshack.com/uploads/1/3/0/4/130488701/02acb.pdf
    • http://fedorahosted.org/lohit
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e8.bin
336e4dcb503af5858c3b7654aafdc6b86454a5c3f5c9db95e43ea657cb9a2acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E8 8220 bytes
font_01_sfnt_off000082bd.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BD 1388 bytes
font_02_sfnt_off00008a22.bin
58ed1a15da2ca65f9e60aeff0063b9deef832e05b1ec200d58826e96ecf2ea49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A22 7280 bytes

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