Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b676d9c5ac02a6b…

MALICIOUS

PDF

32.8 KB Created: 2020-08-06 19:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0284de4ece61f8ee96c3112ce3f4a0 SHA-1: 591dceed1f742e72df0d482311ca3a32e5b55e97 SHA-256: 6b676d9c5ac02a6b530bc7db04597993712943b0240413729101f075ddb3babc
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=converting+pdf+to+word+without+adobe'. The document body, though heavily garbled, contains text related to PDF conversion, suggesting a lure. The presence of multiple external PDF links, some pointing to potentially benign Shopify URLs and others to unknown domains, indicates an attempt to distribute further content or redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=converting+pdf+to+word+without+adobe
    • http://gisanez.beautyblissbylisa.com/uploads/1/3/1/3/131383544/tigoduxib.pdf
    • http://files.stmatthewsbaptistchurch.com/uploads/1/3/1/6/131606392/sufexevigidet.pdf
    • http://files.foundationforsustainableliving.org/uploads/1/3/2/6/132695416/1718880.pdf
    • http://files.paulisplayschool.com/uploads/1/3/2/6/132695531/nakanafativ.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/amadeus_electric_quartet.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/39185278306.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/raspberry_pi_power_supply.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/37202237676.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/49759900311.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/american_chopper_death.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/62223849046.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/sabekakobabutezemere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/w3schools_javascript_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/71982693992.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/32400650478.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/28523273854.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/24244129376.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_off0000436f.bin
ba9f8f1eee962e51cbf7f9e2105afa24a66c97a390a3601109ac2782a5e67248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x436F 5288 bytes
font_01_sfnt_off0000557d.bin
89eb1b834fa8569c20c17574a910864b6708990b42e55c094d732d73be6e2bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x557D 9172 bytes

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