Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f39b495ff87054…

MALICIOUS

PDF

41.3 KB Created: 2020-08-10 03:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efad709ecdbc71a7c2ef28d8707b3d7d SHA-1: 39b8d471bcbd137d8e2d9fe56fcaa4b09558825f SHA-256: 52f39b495ff87054e86582fd47a344e29da3394a6e182a7866bf2bfb8a6b2ba2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm and another pointing to a known malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=tornillos+de+banco+definicion+pdf, which is likely used to direct users to malicious content. The document body itself is largely unreadable binary data, but the presence of numerous links suggests a social engineering or phishing attempt.

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=tornillos+de+banco+definicion+pdf
    • http://files.erinredfern.net/uploads/1/3/2/6/132682802/wirawetek_xiradekiw_davuz.pdf
    • http://files.wiesbadenspousesclub.com/uploads/1/3/1/6/131636766/0941f784.pdf
    • http://files.tcusanationals.com/uploads/1/3/2/6/132695203/sakanaxa.pdf
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/medical_laboratory_technologist.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/33904971159.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/how_to_make_a_discord_server_active.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/73917071510.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/bamidapasejojomotuzoruv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kumug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/gugelixajajitilapul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/zaduwozametatofowowutas.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/37640484793.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/functional_analysis_stein_shakarchi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/jotilomu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/kakejesiboxiwojakiponoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/sales_agreement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/sefidonibuxikedinum.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_off00006127.bin
e553f54168c65267f9c8ff076440ed528d0a52c949cdbadbd3e8c7f1fd103785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 5236 bytes
font_01_sfnt_off000072fd.bin
6e5ac04b6ae8094f24ee15ca44f93924cd4bb9b37c1eedb5e5bafc0d5f304c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10948 bytes

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