Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfdfd17b267815e…

MALICIOUS

PDF

39.0 KB Created: 2020-09-01 03:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f01c1f1459fde93dddb6c620ce7ca2 SHA-1: eb9bbfb1e40f6d1659fb246e7664dc9a2a88dddd SHA-256: 6cfdfd17b267815e040bf734edb1881ae8c154604810a9fc9e716811d36ad866
154 Risk Score

Malware Insights

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

This PDF is classified as malicious due to its structure, which includes a large number of embedded links to other PDFs, a common tactic for SEO link farms. One of the primary links, 'https://ttraff.cc/wix?keyword=reported+speech+definition+and+uses', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and others, suggesting an attempt to drive traffic to malicious infrastructure under the guise of providing information.

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.cc/wix?keyword=reported+speech+definition+and+uses
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/78310594643.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/rimizebugugubuwijibir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/fijuzedabaluw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/rabararuj.pdf
    • https://static.usrfiles.com/ugd/f515ca_5b452d59462e4ce199262e738732d45e.pdf
    • https://static.usrfiles.com/ugd/2e16aa_904139902cdf47b2a61b0bbc2af9eac5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c77c4f83cf0b435186e298cc215dd05c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0444f4670e5641759cd886d5c46e78c8.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/76908547682.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4256/files/gerefafadigewusubejop.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/windows_command_line_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/ielts_reading_answer_sheet_british_council.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/45854402469.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_off00005a75.bin
6e280395e03b5685e6e2cb271614ed9d3336cf9a6f15a3f5cda5e3cebb69cd73
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5220 bytes
font_01_sfnt_off00006c39.bin
e2814f17f2c30a9acbfcdfa47793418021ccdc171d6e680ed4d626c9e298a9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C39 10304 bytes