Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c36c2d43af0a294…

MALICIOUS

PDF

42.9 KB Created: 2020-08-06 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b934a85eeb26c6d040509df0c23390 SHA-1: f49595a0efa50b0fae45ed4b073f102a1d6dcc5e SHA-256: 5c36c2d43af0a2946c73baf9d2c99d2e91d3cc441da592fd2696cb8a02beff70
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about aluminum properties. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content. The document body itself is heavily obfuscated but contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=7075+aluminum+properties+pdf
    • http://files.aauhawaii.org/uploads/1/3/0/7/130738928/kuvil_fepaxobepeliris_mamijuj_refonoxezog.pdf
    • http://files.flligiglio.com/uploads/1/3/2/3/132302733/fefoxatozipit_jajiramiputodoz_lazakoluvezot.pdf
    • http://files.endofbelief.org/uploads/1/3/0/9/130969003/vatusezipusofif_nonivoxujida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2737/2964/files/68148637065.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/33634926871.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/67220461727.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/tumalabesuzadesejunajoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/21962567217.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/konizifisibikofidazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/xuborisejajafewagerelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/66998773821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/nexusamilizuvugovisibifaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/23325118579.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/1464414768.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_off000069bb.bin
6ca37862affd6bd98d1609c99aec4b5e94c62670496be4a041abe1ac9b65fe94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 5440 bytes
font_01_sfnt_off00007c29.bin
3a5d297e142e0ff21379165bbc881383d3b5256087ce6dfdb96e89b1e5ef0bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 10180 bytes

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