Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1f632b9bf79bbd…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 00:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5376e9cebbb8ab6f4e0703b8bce965f8 SHA-1: c90975ccbf64af607bd346d7e918f527fc13ed1c SHA-256: 6e1f632b9bf79bbd4cc2bd2a9bac4f73a18827dc0bddaac31f9644b4ea60786e
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a redirector link, disguised as exam paper downloads. The ML classifier strongly indicates maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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.com/pify?keyword=jee+main+2020+online+question+paper+with+solution+pdf+download
    • http://rutos.artsforactfineartauction.com/uploads/1/3/0/7/130776433/penaf.pdf
    • http://files.omolmentoring.org/uploads/1/3/1/4/131406068/jixisom-peradeperorixum-zosob-kusiguzaru.pdf
    • http://files.loftconversionsderby.co.uk/uploads/1/3/1/8/131858592/3992335.pdf
    • http://files.crompers.com/uploads/1/3/0/8/130874631/bf18bab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/15645088853.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0528/files/youtube_audio_quality.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/biochemistry_laboratory_rodney_boyer.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/giruzaturipebepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/83153045149.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/fowupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/panetixiwepapofenajujolov.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/ludalosivis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/tipos_de_adjetivos_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/24761278840.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/webudonuluta.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/88534984065.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/17674932872.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_off00006a96.bin
bbbd9173bda89c6ddf447fca250070c418a5aca1a0e475bc120a897dcc9bc166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 5760 bytes
font_01_sfnt_off00007e15.bin
be5f6e49b830eb189b2b1a99e3b105132365c67b38627516296698d2ca472049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E15 10192 bytes

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