Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c96460b38c3926…

MALICIOUS

PDF

56.6 KB Created: 2020-08-20 01:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c977e64c94e369fc1b46992f1b78bcdf SHA-1: 231f32cbe1d808142c551acde23d47a697b7b3fc SHA-256: 85c96460b38c39261928ad8ec844ec73fe635aa1fdde0a1e6f8486ebea02d746
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=swarna+chamaram+song', which is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, likely for phishing or malware delivery.

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.ru/pify?keyword=swarna+chamaram+song
    • http://files.spiritual-research-network.com/uploads/1/3/1/8/131856046/2492982.pdf
    • http://files.birthbygracemidwifery.com/uploads/1/3/0/7/130740483/6e0c9bf4.pdf
    • http://files.keystonekidsgo.org/uploads/1/3/1/3/131380625/1afc994c8a1745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/14247889642.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7843/files/51973360273.pdf
    • https://cdn.shopify.com/s/files/1/0437/2722/4986/files/articles_grammar_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/87573662617.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/23216936542.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/jenis_obat_bronkodilator.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/xorelifa.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/gisepobiximenisuzimibupuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4376/6950/files/writing_linear_equations_worksheet_kuta_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/67390800575.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/nasemudokupewu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2765/0970/files/57516322373.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008306.bin
8d125b07469fff334d94d7b8df122ca96f7559fe04b18222988905cd5b61b953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8306 5376 bytes
font_01_sfnt_off0000951b.bin
5f65bf3b89c163007e49b4b424d458816ead450d0416918528607b8540cf3189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x951B 3432 bytes
font_02_sfnt_off0000a291.bin
d20b7eb12cc4b59e54f027350bfa25fa642abaae1bc52f9f179b19fc50d0d55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA291 15600 bytes

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