Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db70760fac31335…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 02:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fef69abff52be6ed79a420a32f1ffef1 SHA-1: e9088145eb6b48e0f6db2b1e839444c3c9a7c3c7 SHA-256: 5db70760fac313354d1b4a5bd53305eb0f9120cdecc8ea2ceee248b378d7f2d4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

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/wb?keyword=english%20language%20as%20lingua%20franca%20pdf
    • http://tozisu.averagejoespodcast.com/uploads/1/3/2/6/132681579/613721.pdf
    • http://files.artandroulla.com/uploads/1/3/1/3/131380773/6e51b943ebb202b.pdf
    • http://files.usanhr.org/uploads/1/3/0/8/130874050/rijisuguz.pdf
    • http://files.cantstopforeveryimpala.com/uploads/1/3/1/4/131482946/gumowe.pdf
    • http://soviwewex.bulldogsoflongisland.com/uploads/1/3/1/3/131398140/zetawav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/83990514912.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/ielts_writing_task_2_topics_with_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/linux_network_tools.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/12th_bio_botany_practical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/doparidevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/buvomabosuminuwerajazeruv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/29612912170.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2876/files/juwamigub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/core_beliefs_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9622/files/sewomanawejowaxariwalivaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4084/9575/files/40357866051.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/d_d_5e_acquisitions_incorporated.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_off00006422.bin
36de8baf6623d5294fde22317bc28d74770db3f1a6d37178b8f6adc34873e19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 5376 bytes
font_01_sfnt_off00007661.bin
f70ef3b011220b16a6035b5419244aae14915d98d7c51956e235364ef36de7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 9872 bytes

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