Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75a5915b79f766…

MALICIOUS

PDF

50.7 KB Created: 2020-08-08 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf371d8c781af003ead7a60b3a047113 SHA-1: e3791943eeb616a675df085da2e7d9707c8f7981 SHA-256: 3a75a5915b79f7669fec8271fe0ec79fe48afe7ac736959ad9a7bc3809221464
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=a+ladder+to+the+sky+john+boyne+pdf'. The document body, though heavily obfuscated, contains this same URL, indicating it is the primary malicious payload delivery mechanism.

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=a+ladder+to+the+sky+john+boyne+pdf
    • http://files.nycridingacademy.org/uploads/1/3/1/3/131381352/353600359c5d26.pdf
    • http://files.kreativekael.com/uploads/1/3/0/8/130813747/e7507.pdf
    • http://files.tidytimeservices.com/uploads/1/3/0/8/130874522/jijojebobazejij.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/54146831345.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/parvana_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/kopopoxuboxaverefojajupuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/59807470043.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/jerixanajimopupisafinunux.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/technical_interview_questions_on_java_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2821/5968/files/neet_biology_practice_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/use_boxmen_level_7.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/20441359622.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/xipazotogopefusokig.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/learn_french_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/7093209195.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008680.bin
5c58bb59b02b9f5a871e7f0e7332df3429ad1f73f529280862e8f5b855bded11
pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 5500 bytes
font_01_sfnt_off00009934.bin
fa3690833a49683494db50acf6b4bcf928bcc777d74fc11c4be5d524203fdacb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9934 10652 bytes