Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc38d4fa28e31c…

MALICIOUS

PDF

70.4 KB Created: 2020-08-07 01:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9f59a64867d372d57a82047a62e675 SHA-1: 7e6b5d479f9d5216eb2091b7e0dd56fbf2e8d0ca SHA-256: 57fc38d4fa28e31c25899ecb498a78ecb2f6bafaef578241c025a39e8ead6d3e
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The embedded URL 'https://ttraff.cc/pify?keyword=caperucita+roja+version+original+pdf' is a strong indicator of malicious intent. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, many of which point to benign content but serve to mask the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=caperucita+roja+version+original+pdf
    • http://files.funnyfarmanimalsanctuary.org/uploads/1/3/0/9/130969873/vugorozuzomalomowo.pdf
    • http://files.chriscaddellmusic.com/uploads/1/3/0/9/130969452/7329419.pdf
    • http://files.frontrangebehavioralassociates.com/uploads/1/3/1/0/131070688/maledekodi.pdf
    • http://files.jeffkirchoff.com/uploads/1/3/0/9/130969772/zovixomejuwujo.pdf
    • http://files.buildhealthyseniors.com/uploads/1/3/0/8/130813988/67c91d4d2.pdf
    • https://cdn.shopify.com/s/files/1/0440/1594/3845/files/us_national_anthem_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/33274530632.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6231/files/jomamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6712/0539/files/teatv_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/24665945641.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/nabutifuteguraxenexukozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/12328976030.pdf
    • https://cdn.shopify.com/s/files/1/0435/1832/8991/files/67227476272.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/the_top_five_regrets_of_the_dying_bronnie_ware.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/fetesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/zuwunagiwil.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_off0000d6bc.bin
2e67d2763e9e3947c416bd2a50ff67c8558d955f8b5fc9c266f06fa0e93d6f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 5364 bytes
font_01_sfnt_off0000e913.bin
139d89c838db3dcf207a406700bb9fd3d83be1cd19955d748c2fa7e992cc073d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 10276 bytes

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