Malicious PDF — malware analysis report

Static analysis result for SHA-256 61263a8f2084fcdc…

MALICIOUS

PDF

62.8 KB Created: 2020-08-09 01:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d50b3c5c0165ea1c646e8c11ac9042 SHA-1: 1f029222e0342eb52c2c45f096d442e9e0c88997 SHA-256: 61263a8f2084fcdc3146c7b8015c83210a00f3bebd3044b8344b386217fd58d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download further content, likely malicious. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=basic+accounting+rules+in+gujarati+pdf
    • http://files.amphionpercussion.com/uploads/1/3/2/6/132681464/pevikawejof-koroviposof.pdf
    • http://files.nbbcob.com/uploads/1/3/2/6/132681394/niwusekezuforemirodu.pdf
    • http://files.kingschapelashford.com/uploads/1/3/0/9/130969386/xabikuwofabesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/kidipomorunilojewepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/18527893988.pdf
    • https://cdn.shopify.com/s/files/1/0433/5016/3609/files/netcat_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/36501713049.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/bijedebevirajagovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/majusotogozarow.pdf
    • https://cdn.shopify.com/s/files/1/0449/9036/5864/files/bioenergetics_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/gozebukuviromaxile.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0498/files/terarupibizutinulujige.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/15188924561.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/1679167147.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000633d.bin
00b790d481c580658b555c027e20c91ca96f381d87dac9364ed8815f1a95fbd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633D 5448 bytes
font_01_sfnt_off000075d6.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 3720 bytes
font_02_sfnt_off00008138.bin
a618c0b16c249e0c39d1934e6c646c1ff09947e954d25bd6198c046940da1763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8138 8144 bytes
font_03_sfnt_off00009b34.bin
34a12103eb955b9242228b2c5f5e7710d803e386c9c6da6179a064add75f53c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B34 10012 bytes
font_04_sfnt_off0000bdbd.bin
988a316f543fb787c6e548b45acc8bfd59cad13da049e9ddbad57dfbfbb9e7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 16120 bytes
font_05_sfnt_off0000d2cf.bin
b5691caa1c313c2f0b209d6b4e6edb3d1ee9776f406df5ba081a15fa28904199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 7296 bytes

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