Malicious PDF — malware analysis report

Static analysis result for SHA-256 67153243f8ab91c5…

MALICIOUS

PDF

33.4 KB Created: 2020-08-22 11:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f7c9037ccb18fb5377ae846e32cb33 SHA-1: 5b8f3b40bdb11d88dd0fdee1b0e4e2e461617583 SHA-256: 67153243f8ab91c559ace77863f4981dcf5c1cf6b97b339174b0b00cd622e064
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational worksheets. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

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=blank+map+of+central+america+worksheet
    • http://lasigupes.orangecountycoffeeroasters.net/uploads/1/3/2/8/132816066/rejiwosuzonupep.pdf
    • http://vosiboru.maidans.org/uploads/1/3/1/6/131636908/soledu-nezezegexata-jikabuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/nanoxewisozaxas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/filifofumulexikalexos.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/download_pdf_agama_islam_kelas_11.pdf
    • https://cdn.shopify.com/s/files/1/0435/4031/6311/files/miwimogemofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/rekilos.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/fogefagunofobibu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/tinkers_construct_all_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0465/4897/5774/files/funny_games_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/2739/0615/files/68443686469.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/wuxorujukesudotutabojel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/89041312225.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_off0000443d.bin
efd4faa73a1f4d734120278cb9db39858b3c8ddc884a5d02e7d9c4aab38cad75
pdf-font-stream PDF embedded font (sfnt) at offset 0x443D 5460 bytes
font_01_sfnt_off000056b5.bin
1d79545ab2707026d696d21ab589739614685c2fbf7559c1e67d4d65d225988a
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B5 9856 bytes