Malicious PDF — malware analysis report

Static analysis result for SHA-256 954290dfdc6a6e26…

MALICIOUS

PDF

43.2 KB Created: 2020-08-13 20:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed88da488ccc6e58c1a154574145753f SHA-1: 6705b7efb38f2b8632a3fe790d69569047d46f7e SHA-256: 954290dfdc6a6e2664abd47c21395be450033dc78903cc1754036597b1ed3ac8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially corrupted, includes a phrase related to deleting text in PDF, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely for phishing or malware distribution.

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/wb?keyword=delete%20text%20in%20pdf%20acrobat%20pro%209
    • http://files.amymclain.com/uploads/1/3/1/4/131453221/a284162.pdf
    • http://files.metahatem.com/uploads/1/3/1/4/131407369/gevanovopadivasuta.pdf
    • http://fadatijo.jarryjornopublishing.com/uploads/1/3/1/4/131437987/0a431583c7.pdf
    • http://kalejune.ingpro.at/uploads/1/3/1/3/131379578/lurizamewanevik.pdf
    • http://files.stcatherineofalexandriachurch.com/uploads/1/3/1/3/131383434/sumikixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8438/2357/files/59345545489.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/nomenclature_of_carbon_compounds_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/venice_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0394/files/el_alquimista_paulo_coelho_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/list_of_words_with_prefixes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/12043861593.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/cobra_mag_id_unturend.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/define_economizing_problem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2614/4670/files/88451865323.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/dolesafojetogonasifub.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/julida.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b64.bin
ac34129ef0da1cc39f860d1415c4c801e79800ef447da86696a81b168a2043a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B64 5124 bytes
font_01_sfnt_off00006cd5.bin
2860fd1aed03784d5c0c8dfab9ad12a4080288c5e92d93120404ba0a0f1a510e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD5 10752 bytes
font_02_sfnt_off000091c1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C1 4324 bytes

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