Malicious PDF — malware analysis report

Static analysis result for SHA-256 625038595e7fa95f…

MALICIOUS

PDF

50.4 KB Created: 2020-08-12 22:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279f55ca3852a4520f10442c38687991 SHA-1: 682f374b35dae2ad3b6848027c6aee1d6f4a7b99 SHA-256: 625038595e7fa95f07c597bce2e6cb5d6a60ff3fc800a564c6287f26d19ea1f4
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body also contains this URL, suggesting an attempt to lure the user to a malicious site. The presence of numerous other PDF links, many benign, indicates a link farm strategy to potentially improve SEO for malicious content or to obscure the primary malicious link. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=jurnal+klasifikasi+jamur+basidiomycetes+pdf
    • http://files.nicoledigiacobbe.com/uploads/1/3/2/8/132816096/latovi.pdf
    • http://files.ftpc.org/uploads/1/3/1/8/131856725/bixosorimerikum_bopujirafewizuw_gavabos_petenedu.pdf
    • http://files.leonbergersofnorlil.net/uploads/1/3/2/7/132741348/8af08abeef.pdf
    • http://files.pszichokardiologia.hu/uploads/1/3/0/7/130740213/lonaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/sugamikem.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/belajar_bahasa_arab_pemula.pdf
    • https://cdn.shopify.com/s/files/1/0436/7872/8345/files/geological_map_of_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/81842141310.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/report_on_classroom_management_strategies_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/vakigisiverovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/sizosijixewilamos.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/online_bengali_story_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/97396787167.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/arquitectura_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5333/files/chakras_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/gisenuvaveturosuragimun.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_off00008641.bin
8de54548f2beeb215882959d09a442bfe3eda88917a19f4e0cec726969e5526c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8641 5672 bytes
font_01_sfnt_off0000997c.bin
017e447ff86e1ac0a4a79828cc11ceff79e2728ad5dfda4779b1bc6397d1ec1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997C 10172 bytes

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