Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f6843cbbe343c…

MALICIOUS

PDF

62.2 KB Created: 2020-08-09 23:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e0d38f02757b4e233f71f3c668f5c6 SHA-1: d47d77ddf14159637d40e76e6938977f43d3e0f2 SHA-256: 7c4f6843cbbe343c88260e836b2ba66e867f1c26995f22211a532b9ed0adb062
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a book download, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of 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=the+authoritarian+personality+book+pdf
    • http://files.businessformedicareforall.org/uploads/1/3/1/4/131411596/6063172.pdf
    • http://files.popescreationsandthings.com/uploads/1/3/1/4/131410007/fejesevenatifudufo.pdf
    • http://files.westcoastmohel.com/uploads/1/3/2/6/132682230/faweju_jubalani_femog.pdf
    • http://kadupezo.physedresource.com/uploads/1/3/1/4/131453902/wenufutuguno-takuzifigijig-fofodefijivi-refojava.pdf
    • http://files.berryflats.net/uploads/1/3/0/8/130814118/3986397.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/98719300517.pdf
    • https://cdn.shopify.com/s/files/1/0437/8761/6413/files/liste_allergene_und_zusatzstoffe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/felipajadifog.pdf
    • https://cdn.shopify.com/s/files/1/0450/2857/3334/files/carrying_you_castle_in_the_sky_piano.pdf
    • https://cdn.shopify.com/s/files/1/0448/1040/4000/files/adobe_reader_offline_installer_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/adani_ports_annual_report_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/53719268139.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/cell_cycle_checkpoints_review.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/volazugex.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/fepajewavefugiz.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/ptr_7._1._5_patch_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a82a.bin
390778d47889ed12caedeaf9c743a799aa82e05ce1e4000677abc4331566f327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA82A 5268 bytes
font_01_sfnt_off0000ba0b.bin
0d42b4b6077d5dfd933f86bbb1e2f116ad93db4af6ea0bac5e0c07f8c785c661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 10308 bytes
font_02_sfnt_off0000dd6e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 4324 bytes

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