Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2030ddc6240aab9…

MALICIOUS

PDF

38.2 KB Created: 2020-08-21 10:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6381c09ced77245e3d04d79d167d3bb SHA-1: e41663ee45a7c63c5b2fb2b50c77fc3244b648ac SHA-256: c2030ddc6240aab910721f896b5bfe7b2ddc5040423088d8553ec02b3237ed6e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, pointing to various domains including a known malicious redirector at 'ttraff.ru'. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the primary malicious URL, suggesting the document's purpose is to lure users to malicious sites.

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=majnu+old+naa+songs+free
    • http://sikujos.agefriendlysarnia.com/uploads/1/3/2/6/132696056/lerur.pdf
    • http://files.annettedavisart.com/uploads/1/3/1/0/131071041/jikorinedunen.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/problems_on_payback_period.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8502/files/fulopowepurogaworap.pdf
    • https://cdn.shopify.com/s/files/1/0437/7267/4209/files/76296542460.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/januxapev.pdf
    • https://cdn.shopify.com/s/files/1/0434/8012/1506/files/adding_and_subtracting_polynomials_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/0354/3715/files/delanije.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/xiruvaxugojebudasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/2734971864.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/1105110568.pdf
    • https://cdn.shopify.com/s/files/1/0451/8245/1861/files/american_english_file_3_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/used_rubber_sheet_making_machine_in_kerala.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/
    • https://cdn.shopify.com/s/files/1/0451/8245/1861/files/american_english_file_3_wo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d4.bin
267ef0fc31b055ca89dde9f3ff06c01dcaac743dac64232e5dccaef00d7cbbd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D4 5156 bytes
font_01_sfnt_off00006a72.bin
aa0a322e9258331552305cf8b08543fb1944a5309d71e1ef3b32ba0dad101ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 9784 bytes