Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7966ced18fc3fe4…

MALICIOUS

PDF

38.4 KB Created: 2020-08-03 17:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2049858aab375a7feb6e082ba4af79a SHA-1: fb25fd55e07e1028d297c467f13e31c7c6af586a SHA-256: f7966ced18fc3fe4a0d7f4962e1afccd82fd64e6422283534ae6b6f208c425a3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=entrepreneurship+development+book+by+rajeev+roy+pdf`. This URL is likely used to lure the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, suggesting a link farm or redirection strategy. 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=entrepreneurship+development+book+by+rajeev+roy+pdf
    • http://files.drobscience.com/uploads/1/3/0/7/130776420/1790870.pdf
    • http://files.aesopinstitute.org/uploads/1/3/2/6/132681660/2585823.pdf
    • http://files.pierceschoolmusic.com/uploads/1/3/0/7/130775537/8893926.pdf
    • http://files.grandmaceilshouse.com/uploads/1/3/1/4/131408529/92347f03614c5.pdf
    • http://files.zockolluniversity.com/uploads/1/3/0/8/130874413/4136158.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/72510765338.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/73181018158.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/36904843933.pdf
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/85719784321.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/avita_paper_shredder.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/deadly_mutilation_skyrim_se.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/wibabuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/lovakavejutexoxakesibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/84160854606.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1167/files/nukimepuzalozirokasebinem.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_off000048ab.bin
cbdbda8e6fc2514f1455ce797148216824695ddbe3a2894381386aa98e8de02e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48AB 5560 bytes
font_01_sfnt_off00005b6f.bin
795ba8e4587fc3b591649f967a6e4e6e56e5d3895c3a50799df670926fa7608c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6F 10088 bytes
font_02_sfnt_off00007dee.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEE 4324 bytes

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