Malicious PDF — malware analysis report

Static analysis result for SHA-256 a632da1ae6fe1dcb…

MALICIOUS

PDF

32.1 KB Created: 2020-08-23 20:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a94be3210fe518693ba21b272ff92a SHA-1: acb517a5c6825af98761471de2b0285259870d25 SHA-256: a632da1ae6fe1dcbca6842705ddbf64e792f7de41e04ee822fed1f6b362f0139
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that is disguised as movie content. The ML classifier strongly indicates maliciousness, and the PDF structure includes a link farm, suggesting an attempt to distribute malicious content or engage in SEO abuse. The primary malicious IOC is the redirector URL, which likely leads to further 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=thriller+horror+movies+tamil+dubbed+free
    • http://files.ctkluth.com/uploads/1/3/2/7/132711954/93cbe49bc441f81.pdf
    • http://files.shelbylwood.com/uploads/1/3/0/9/130968943/labisexifemuge-telot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/wosenidogonoja.pdf
    • https://cdn.shopify.com/s/files/1/0450/5144/5400/files/literary_devices_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/47999247097.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/rovapagewodefaxenuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/article_about_english_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0433/6972/6110/files/tufarumusigogenop.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/38626266298.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/xotudimowozavepamulas.pdf
    • https://cdn.shopify.com/s/files/1/0454/0334/0968/files/neladumavizozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/62565624226.pdf
    • https://cdn.shopify.com/s/files/1/0439/1380/5992/files/jemuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/pamatujamepufujeketojox.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_off000041f5.bin
2e3f918f383aa4b4c7a1d7dcbabb1d778a56e2f575f0cf03be16dd69287e5906
pdf-font-stream PDF embedded font (sfnt) at offset 0x41F5 5296 bytes
font_01_sfnt_off000053d3.bin
4d0ff8af825d6dd510badf299d5e41a72b3f3090cf5fd1a714cad23d855b4c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 8788 bytes