Malicious PDF — malware analysis report

Static analysis result for SHA-256 637d1179415c5fbd…

MALICIOUS

PDF

37.5 KB Created: 2020-07-30 21:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36124305afdba207704dff55289651db SHA-1: 3f256aab05203fe5f1b4bca2c5dd97584ad7b3fd SHA-256: 637d1179415c5fbd3de45df09585ebaeef19bbb1dc1ecb19a447b1c7c32cd2fd
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'Emerald tablet billy carson' to entice users to click on the malicious links.

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=emerald+tablet+billy+carson+pdf
    • http://files.ligonierhighlandgames.org/uploads/1/3/2/7/132740798/8d38c81a28d7a35.pdf
    • http://files.spsyc.online/uploads/1/3/1/4/131483108/9279828.pdf
    • http://files.myececlass-safety.com/uploads/1/3/2/7/132740339/lubamifogibuxovawo.pdf
    • http://files.jacobcharton.com/uploads/1/3/0/7/130740138/bosowine.pdf
    • http://files.muncasterfinancial.com/uploads/1/3/1/4/131453713/44f880f75e4c20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7606/6211/files/wotivakeravovotebadagarub.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/fediwagagal.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/58223521916.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/14462522171.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/3528408127.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/41731715257.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/65373944896.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/lerax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/15803681554.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/3065942159.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/xigepifavenetufej.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/59657895601.pdf
    • https://cdn.shopify.com/s/files/1/0435/7724/5859/files/zorif.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_off00005732.bin
d64b6812fb53969b560e502ac690eaae24986459177246b8504522ffcbbe1e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5732 5288 bytes
font_01_sfnt_off00006907.bin
41d3a91b44c25ae8e6f57029d7820c127585222015c37ad4de8e8eeb8709054c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6907 8876 bytes

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