Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52d18d7d280915…

MALICIOUS

PDF

37.4 KB Created: 2020-08-31 07:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a6a4b4766b975d8890712b214fe253 SHA-1: e10c71ef2b936f92736315857c4365230b392e31 SHA-256: 8f52d18d7d280915e200d6803f8618e645ff1e01705ea93b791afad29cb7cc6e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is a strong indicator of malicious intent. The document body and embedded links suggest a lure to a link farm, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wix?keyword=setra+super+count+manual
    • https://static.usrfiles.com/ugd/b8c837_92460ea311c6494fae54c155528fd7d6.pdf
    • https://static.usrfiles.com/ugd/32acb1_31a89a80c28142be8d39ef1ddefd7b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_16479d6eafdc437fa583bb2210179fda.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/78714193091.pdf
    • https://cdn.shopify.com/s/files/1/0436/9478/4665/files/division_of_polynomials_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/15525287035.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/actinomycetes_articles.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/nevibobaxativazuf.pdf
    • https://cdn.shopify.com/s/files/1/0461/9678/5305/files/84779843376.pdf
    • https://static.usrfiles.com/ugd/71fd01_e4724c971f7d40caae4b419cc96e0bc3.pdf
    • https://static.usrfiles.com/ugd/253000_4f4306f405364ee289af4b40ed442051.pdf
    • https://static.usrfiles.com/ugd/cf79db_eaf0cdaea00c42ba84bb6e8ddbf79b6c.pdf
    • https://static.usrfiles.com/ugd/409ca8_5ede6f220efe4cb9a58840f6df6efbdc.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_off00005505.bin
8e1c4a218a84e2c4cc70fefdb015b47e1934a6065022388bc506ba555de9b242
pdf-font-stream PDF embedded font (sfnt) at offset 0x5505 5180 bytes
font_01_sfnt_off00006684.bin
d770618862673ab00a249dac4ba7a93617993466d5ecbdd6fdf79997ced96cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 10164 bytes