Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a8d74fe947f386…

MALICIOUS

PDF

48.3 KB Created: 2020-08-14 23:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da9fe97ca2400fff9668812d1af543bb SHA-1: 3a6cb133f7f8f85b6baf5737662540bad05fe15e SHA-256: 77a8d74fe947f38660a495c9c18947eca886f70d4523961a82894bd842b77638
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=code+review+spreadsheet+template`. The document body, though partially corrupted, also contains this URL, suggesting an attempt to lure users to malicious sites under the guise of a spreadsheet template. No scripts were extracted, but the extensive link farm and redirector indicate a phishing or content distribution scheme.

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=code+review+spreadsheet+template
    • http://rolud.nestingowlstemple.com/uploads/1/3/1/1/131164250/6226288.pdf
    • http://files.islandexperiencevanuatu.com/uploads/1/3/2/6/132695569/luresoruj_xogifopi_rekozuzamozi.pdf
    • http://supumapuk.robesonlutheranpreschool.org/uploads/1/3/0/7/130775934/2000205.pdf
    • http://files.philipsonkelseahaiti.com/uploads/1/3/1/4/131437873/motiju-romiladabemava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/sujezofemiwepex.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/pojasumobafekatunugas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/44385346993.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/d_d_acquisitions_incorporated_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/introduction_to_ant_colony_optimization.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/tamil_blu_ray_movies_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/guzodatosiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/nirazuxesodikuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/33447317592.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/proyecto_de_investigacion_modelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/zuzizidekavuzeleko.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/adp_4500_time_clock_manual.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_off00007dab.bin
caf693d134d85af591136cbee86568ea89f61967497e4de07527581c2b5a5e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAB 5256 bytes
font_01_sfnt_off00008f7c.bin
4fdecd35c13e577afde651e37aeef9564a5306e225f201108d37206067637575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7C 10824 bytes

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