Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275071358100c90…

MALICIOUS

PDF

83.3 KB Created: 2020-09-07 10:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef932b2aacb983301bfbdd33aa06e836 SHA-1: 27a020f3b7b8a517c2f037f2ac0d86c15ffcffa5 SHA-256: f275071358100c9099ce3b590305c4cbf9b2d9d0f96033f732108ec37ba91d8e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/wix?keyword=konar+tamil+guide+9th+online'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to educational material. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=konar+tamil+guide+9th+online
    • https://static.usrfiles.com/ugd/c0a468_9a6bf023f9a241f8a3759e5ea1104eaa.pdf
    • https://static.usrfiles.com/ugd/49be48_d918d9ab88294a8da1d544166791db97.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_370cfe2015964c61a9ceb341efa92807.pdf
    • https://static.usrfiles.com/ugd/b8c837_349c252372984fe9b3410c02ef022d81.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/69378834194.pdf
    • https://cdn.shopify.com/s/files/1/0462/5639/0295/files/horse_racing_game_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/sepiloxuxezufemi.pdf
    • https://cdn.shopify.com/s/files/1/0465/2761/1038/files/animals_coloring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/rovaveziwefiwawa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/figapuxisos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9101/7374/files/37457956522.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/chick_fil_a_catering_menu.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000d988.bin
cd708ea0d3171c11dba2406333422293d00dff9bd7f01ac2d64eacd46f810c41		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD988 19852 bytes
font_00_sfnt_off0000c80e.bin
1c32e22b8d78a4b27ce8cdadf0cf6f22cfa698dfb594fe361ebe5d35f5251079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 5188 bytes
font_02_sfnt_off00010483.bin
4a7a17ef0ba0b87d3101fb253220c21ebf70d31c9b38729fcc60725578a726a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 1944 bytes
font_03_sfnt_off00010dcb.bin
29a47b67fd3cb7b054f7d2844f5b44b1b2bfa78d0584aab010506f720047cb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 11884 bytes
font_04_sfnt_off00013399.bin
a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 2832 bytes

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