Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a21262df775b11…

MALICIOUS

PDF

33.4 KB Created: 2020-09-01 16:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e50862c274c124c6c4a0720413c7190c SHA-1: 998d92ce20fb3814325e5b0ef4125e723d3175fc SHA-256: 60a21262df775b1172568f5ec0947042a68b72ae4776d1680491581fa81ad49e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a high number of external PDF links, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=anbe+sivam+bgm+ringtones
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/western_architecture_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0770/files/fake_address_new_york.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8567/files/jikur.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/40067855314.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/dhaka_university_d_unit_result_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/80418012130.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/29095335395.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/analytical_chemistry_laboratory_experiments.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/jepebote.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1774/files/nefezeluruvafe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/29871869138.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/65072108291.pdf
    • https://static.usrfiles.com/ugd/73c254_40cfa7a553f0413b9d3ed69cbe6e5663.pdf
    • https://static.usrfiles.com/ugd/6c032c_b7193404a7284ac9ace1bf0283788d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce3492ddc904da6843f81230637b7e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca0ca09d60ed4d4681a44e90f1a216d1.pdf
    • https://static.usrfiles.com/ugd/e3c460_4bc05281e2404e19907c23e833552782.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_off000045f1.bin
a7cd73894a6b6bfbb1b51e93032ca66d065cfbfc54b73fa63b45e03c31137a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45F1 5160 bytes
font_01_sfnt_off00005770.bin
640433f8cbcebb81a0ddfd3f74be40c17aa267c3a8493a2c0665db89b4120b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5770 9804 bytes

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