Malicious PDF — malware analysis report

Static analysis result for SHA-256 0221c676b6d8444c…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1db6a30fb8a6bdfad646efd0aabe1799 SHA-1: 9bb1e7aca8f0b66fd5a7a0e39abd77d355182a2e SHA-256: 0221c676b6d8444cf8f0e6c28e7f3fc2769a27df8e7680863c680a433dbd0284
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=socrates+philosophy+about+self+pdf, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains references to the topic 'Socrates philosophy about self pdf' and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=socrates+philosophy+about+self+pdf
    • http://files.neilchalmers.com/uploads/1/3/0/7/130740563/bikixiritu.pdf
    • http://files.worldwide4travel.com/uploads/1/3/1/0/131071145/notabizodifefewol.pdf
    • http://podajewo.eastwestmassagestudio.com/uploads/1/3/2/6/132696323/9196860.pdf
    • http://files.drfaridyounos.com/uploads/1/3/2/6/132681699/7ae3e97fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5221/1099/files/83200055583.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/nijukoson.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/behaviorismo_social.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6235/files/lenoset.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/17422533678.pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/32337503281.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/the_walking_dead_full_episodes_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/99779251189.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5591/files/xobavukumagapujinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.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_off00006a0b.bin
05899bc9b03cbbc2af4e7cbd8d5979953525d20941d6080ae6532a235f874a04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0B 5588 bytes
font_01_sfnt_off00007d09.bin
854e5d6748357f497d31341c459bd70b24d61691d710ae9743af10b4c0583534
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D09 10584 bytes