Malicious PDF — malware analysis report

Static analysis result for SHA-256 62641197fc5699a5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-06 19:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e6d01b3f1d106f2ac9756723179d45 SHA-1: d7a3d96a32611e6015e69c2e8fd699e719ab3a2e SHA-256: 62641197fc5699a5c1d15e21e913948d55be33d8b805b725d6e0c50221c9f3fc
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The document body also contains a link to the same redirector, disguised as a research article. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent.

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=clinical+psychology+journal+articles+pdf
    • http://detalo.newreligioncurriculum.com/uploads/1/3/2/6/132695569/4a8f4ae7ce1f1.pdf
    • http://files.zebini.com/uploads/1/3/2/6/132695543/wimiwokorirob.pdf
    • http://files.duachmusic.com/uploads/1/3/1/6/131606373/96557275cd.pdf
    • http://files.randomgroovybiblefacts.com/uploads/1/3/0/8/130814576/dixidukaduras.pdf
    • http://files.telfairelementary.com/uploads/1/3/0/9/130969026/bd94f2cf036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/4889/8458/files/mesotelioma_maligno_por_exposicin_a_asbesto.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/gojetavavagulokegim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xeniwepisovera.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36726725464.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/11202907351.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/melezenosirulobilido.pdf
    • https://cdn.shopify.com/s/files/1/0445/6002/3711/files/2009_kawasaki_vulcan_500.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/difezidefanurupix.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/free_xbox_game_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/35968217255.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_off0000816b.bin
c9272269fa2b09ea8d6ced897974bcb70d2f0e783b3981c3e5f042e69e68fed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 5500 bytes
font_01_sfnt_off00009429.bin
6da733714b350e5b0443fd5ac78072f03381dbc50bfd660db1f51ee7d99f5e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x9429 10424 bytes