Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b237fc8f400ee4e…

MALICIOUS

PDF

47.9 KB Created: 2020-07-28 18:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a7bc7b284b33bfe93b7994e7f78eebf SHA-1: 5caa1e3734ac2ba7324d8e556cfad86c527348a6 SHA-256: 0b237fc8f400ee4ea9b5f5eeea2f66a2a837be8eeb0ee25e62e2e2a53cea9355
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bridal shower bingo template' and application metadata, suggesting a lure for users. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=bridal+shower+bingo+template
    • http://files.leilamesdaghi.com/uploads/1/3/1/4/131438211/d0fa6fe801d1.pdf
    • http://files.holmeschan.com/uploads/1/3/2/3/132302999/617a485c44018f.pdf
    • http://files.starstuffwithstuartgary.com/uploads/1/3/2/6/132683463/d5df59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/firimawibubojon.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/38018097361.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/66232714835.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/16662890199.pdf
    • https://cdn.shopify.com/s/files/1/0432/7207/7475/files/kutojumudeboremi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0486/files/16582574769.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/bosuxabizujelanetumomazol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/55403964111.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/94539536617.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/zedeju.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_off00007d87.bin
1bd59ad4283d4986f6485257fd640cb0506e6959b0d2cc535ee5211ae06d5e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D87 5440 bytes
font_01_sfnt_off00008fe0.bin
c8b22cf16997c697612026a3c1453924a07a28e318e4bd10f556badf70a96bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE0 10176 bytes