Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9df86cfc1cbb86…

MALICIOUS

PDF

43.5 KB Created: 2020-09-06 18:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19aef4bb30089ac29ba99337aec3516d SHA-1: f81b1d885b479d83e371215bdf50dd72820ac7ff SHA-256: 0a9df86cfc1cbb8627f673814a05bb82fb386a83c52227f9636f199c2c81e9ee
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.club/wix?keyword=recognize+definition+of+derivative+worksheet`, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure.

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.club/wix?keyword=recognize+definition+of+derivative+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/83208115368.pdf
    • https://cdn.shopify.com/s/files/1/0429/5406/4028/files/88589176946.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/destination_a1_a2.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/cryptic_clue_quiz_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/85657567758.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/wirogafudalibevokazus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/bending_machine_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/speed_calculator_megabytes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/calfresh_authorized_representative_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/88405990869.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/adapter_class_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/abstract_nouns_worksheets_for_grade_6.pdf
    • https://static.usrfiles.com/ugd/4c1554_1e65eceeada94effa5e62aac991d4dba.pdf
    • https://static.usrfiles.com/ugd/162fe6_6e552e1c7e404b5bbc41ca04b1d28afa.pdf
    • https://static.usrfiles.com/ugd/be19e1_77128cd29371498da873b0b8125f9213.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_off00006b99.bin
c8f112ef6d8b572ca8c70f24837cd0ba37319682f63446d58648b548b9b072c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B99 5524 bytes
font_01_sfnt_off00007e8b.bin
bf10e40ebe060cb9f6e0ac7b9573b496855897e0b4f6002eb07fb22c2c28b237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8B 10132 bytes

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