Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f12cff03a2cf701…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 11:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a03b52484142902abe32df2953525a2 SHA-1: f2e3a7158cecfd920aa63243e547acc160c8d09b SHA-256: 6f12cff03a2cf7012870cf7f31661fb8283219708f7406fa3fa64a3fde912ccb
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified as a redirector at 'https://ttraff.ru/wix?keyword=the+sonnets+of+shakespeare+pdf'. The document body, though heavily obfuscated, contains references to the same redirector and numerous benign-looking PDF links hosted on Shopify, likely to improve SEO for the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=the+sonnets+of+shakespeare+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/25772931877.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/26687693121.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/26299465244.pdf
    • https://cdn.shopify.com/s/files/1/0438/0544/2210/files/somovajetaxavew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/17496093754.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/wevanadelifopafowuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/blitzscaling_livro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7356/8919/files/teoria_campo_magnetico_2_bachillerat.pdf
    • https://cdn.shopify.com/s/files/1/0449/0631/5943/files/beatus_vir_vivaldi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/biology_textbooks_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/gender_pay_gap_uk_reporting_deadline.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/22713399317.pdf
    • https://cdn.shopify.com/s/files/1/0454/3751/7982/files/37982161451.pdf
    • https://cdn.shopify.com/s/files/1/0438/4250/2818/files/6165731436.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_off000069be.bin
b1215a0ffbd7bc00ed76f3a1fbb05c5c539b5cdac43564919a89b6d160b69e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 5112 bytes
font_01_sfnt_off00007b17.bin
ad6d045ce4d8ff6799f0b372fd8da0269561fcad1894a1114cb966707e1602f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 10096 bytes

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