Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f6690861902d86…

MALICIOUS

PDF

55.6 KB Created: 2020-08-17 02:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2010c0ab049d07740acc018a387b37a5 SHA-1: c4f6ef61c7fcd132c5dbc520a8b791a537ee1ad8 SHA-256: 65f6690861902d8610c74062865c6401edaaf689870cd4abff6229fc76ea8849
154 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for a 'deductive reasoning worksheet'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. 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=deductive+reasoning+worksheet+with+answer+key+pdf
    • http://files.vishmayahealingarts.com/uploads/1/3/1/6/131637362/kibokedekezo_wipivu_fovutisuwezav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/fogipuruti.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/fusufonebivit.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/zebonekagoregufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4114/3454/files/congruence_and_similarity_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/zudojodusikapiwakejujiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3794/1160/files/vawiviz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/types_of_pulse_width_modulation.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/livros_gratis_em_portugues.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_off000099ed.bin
d4a341265523bf601c511379286c6a667f049aedfa7b3761c60af96b9ffa948e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99ED 5700 bytes
font_01_sfnt_off0000ad69.bin
43ed67dd9adb94bef5a8f9295407d58458f47204c86355d81067eacad1e04fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD69 10536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.