Malicious PDF — malware analysis report

Static analysis result for SHA-256 596052645967c897…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 11:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9474016c18e2ceb76e13df36c8a3598 SHA-1: 98aed95ee4c0aee81bc8a72e55bb044ff5499189 SHA-256: 596052645967c89752239ec4f86afaf3bd6cb674f5e5478d4c9a96a63073bc54
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service known to host malicious content. The primary link identified is https://ttraff.cc/pify?keyword=chuy%25E1%25BB%2583n+pdf+th%25C3%25A0nh+h%25C3%25ACnh+%25E1%25BA%25A3nh, which is designed to lead users to further malicious sites. The document body itself contains garbled text but also includes the same redirector URL and several links to PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content.

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=chuy%25E1%25BB%2583n+pdf+th%25C3%25A0nh+h%25C3%25ACnh+%25E1%25BA%25A3nh
    • http://files.c3huu.org/uploads/1/3/2/7/132710763/6079734.pdf
    • http://files.utamdpa.com/uploads/1/3/0/9/130969818/bekomewudad_soxun.pdf
    • http://files.coastguardinvestigativeassociation.org/uploads/1/3/2/7/132740978/975d819b789.pdf
    • http://files.ridingrubber.com.au/uploads/1/3/1/8/131856331/406ec1.pdf
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/gewemiwesegijawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3499/9975/files/98298153307.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/tijebobevonagatazulepi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/44936727779.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/96819909098.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/77182421456.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/17063163783.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/72071185942.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/52354620017.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/wazano.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/nunubidob.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/dinazixebadofekapatev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/teduvezowukumelijodilow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000527f.bin
892e829601ceba9729e7e7e813974ad447583008114f8c671e0faf2f7658734a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527F 5104 bytes
font_01_sfnt_off0000634b.bin
48583b9b2d1902587a5cbb4f1472071c3b58ac2683cdd40987c08c95597e6783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 20060 bytes
font_02_sfnt_off00009093.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9093 4324 bytes

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