Malicious PDF — malware analysis report

Static analysis result for SHA-256 e050c1fc71cf3367…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 12:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7149ca80335fd05ce4c60c4933c34ac SHA-1: 033f86794f4887271113cb6f0f7116c03b74c9ef SHA-256: e050c1fc71cf3367263515ca613cb4b7c72607e3635d0de00ecc57d1f9ddc9ec
154 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it contains a large number of embedded links pointing to various PDF files hosted on Shopify, indicating a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated and truncated, making it difficult to determine a precise user-facing lure.

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.com/wix?keyword=%25D0%25B3%25D0%25B4%25D0%25B7+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25BC%25D0%25B5%25D1%2582%25D1%2580%25D0%25B8%25D1%258F+7+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25B8%25D1%2581%25D1%2582%25D0%25B5%25D1%2580+4book
    • https://cdn.shopify.com/s/files/1/0432/6653/9673/files/nhtsa_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8257/9110/files/wugokezatidafelijobejano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22584543347.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/22031071036.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/17536355453.pdf
    • https://static.usrfiles.com/ugd/451461_6a60ce2e1098492a92c803b35b30180f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a632ee9836d48e6bec1a7a2dcf40888.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/82834886581.pdf
    • https://cdn.shopify.com/s/files/1/0437/6287/6565/files/12883589023.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/75516169570.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/bujimadezunibivorilis.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/ctf_flag_in.pdf
    • https://cdn.shopify.com/s/files/1/0461/9737/5134/files/99812387816.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_off00005594.bin
14eb809f933a35f45de9f6d124b684c294cb63ab4a4da30d92dc18ea047d2e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x5594 5940 bytes
font_01_sfnt_off00006984.bin
18e2333163c7eb5526bcd31aec62a4cb07fb3ce6bb72c2a9bf8a25eae398cd2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6984 13672 bytes