Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81b87b4e6f8d5a9…

MALICIOUS

PDF

34.7 KB Created: 2020-08-07 01:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c638bc1d78c9bc3afc3980127cd5cbf4 SHA-1: 74b939d3179693812705cbd15b392fc053a41d2f SHA-256: e81b87b4e6f8d5a9ec83225e71c62b0234d71e2dff6a8ae31540a9c66b1128c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=jurassic+park+theme+piano+easy+pdf'. The document body also contains this URL, suggesting the primary purpose is to redirect the user to this malicious site. The presence of numerous other PDF links, many hosted on Shopify, points to a link farm SEO tactic to obscure the malicious redirector. No scripts were extracted from this sample.

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=jurassic+park+theme+piano+easy+pdf
    • http://files.bridecon.com/uploads/1/3/0/7/130739916/8992394.pdf
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdf
    • http://setilifu.reneetenna.com/uploads/1/3/0/8/130874063/5462377.pdf
    • http://files.brouleepublicschool.com/uploads/1/3/2/3/132302924/xesonalejilili_kegap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/beko_washing_machine_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/8705/0390/files/30714040222.pdf
    • https://cdn.shopify.com/s/files/1/0447/3644/6613/files/router_buying_guide_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/mfc_490_cw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/millard_erickson_christian_theology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/linksys_ea6900_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/412272818.pdf
    • https://cdn.shopify.com/s/files/1/0429/7549/4300/files/shona_alphabet_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/67417238965.pdf
    • https://cdn.shopify.com/s/files/1/0437/4413/3281/files/zojifopulukuzonipakidonom.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/canvas_uky_edu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/11537038644.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/pudukes.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d8.bin
9435f23fafaf15877d6173aef4136b7b9b291f34f80e085ed297a774159d78a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D8 5516 bytes
font_01_sfnt_off00005b77.bin
1e3f3ad3b6d495d69a1d3797af241da74c9e1aaf689a7861ba8f860bcb3e6d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B77 10384 bytes

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