Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c974db09a339b9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d882f7af9c33622f4101ddd30163dc61 SHA-1: 284154000b2ad27bcc3be427c966796f1d59db21 SHA-256: 64c974db09a339b9ee443ef5744c4a2cb5ee5ecabd8923c4f4001d5bb148a71b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting the document's primary purpose is to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of the PDF.

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.ru/pify?keyword=function+of+applied+social+science+pdf
    • http://files.customcontractinginc.com/uploads/1/3/0/8/130813975/roxoxiwag.pdf
    • http://files.mutianyugreatwalltours.com/uploads/1/3/1/4/131407194/1041215.pdf
    • http://files.toddrobbins.us/uploads/1/3/2/8/132816036/kufudo.pdf
    • http://files.factorycarts.com/uploads/1/3/1/4/131453024/sutoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/tadivegumimiwuxufifu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/zezelodafawatidotuwan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/japeses.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/97145899238.pdf
    • https://cdn.shopify.com/s/files/1/0437/7516/4574/files/45001827052.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/60027211557.pdf
    • https://cdn.shopify.com/s/files/1/0437/3112/4385/files/1736843083.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/cracker_barrel_menu_breakfast.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/ansel_adams_livros.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/96748248709.pdf
    • https://cdn.shopify.com/s/files/1/0435/3507/3448/files/jathaka_alangaram_tamil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ac.bin
09a673135eeb13e43dc091a3cd532404731205dbe6cb50d4b7685bfa53aedc61
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5008 bytes
font_01_sfnt_off000077cf.bin
dd99cd05d28f16714b4baf97d4c76376ad82106fc1e09bd1835d4d71521a7d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF 10448 bytes