Malicious PDF — malware analysis report

Static analysis result for SHA-256 9253c0963b4709ed…

MALICIOUS

PDF

63.4 KB Created: 2020-07-25 23:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1b2349b7bc139a35e560acb41c89d9 SHA-1: 6d3d8f6e30887354ae4d5e5cb26ec144119b1290 SHA-256: 9253c0963b4709ed5cbeee5ba3ef66d144f73de4978ddb992590d1625f714853
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits a PDF link farm with numerous SEO-optimized PDF files hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure, but the presence of malicious links and the link farm strongly suggest a phishing or redirection attack.

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/pify?keyword=java+swing+display+pdf
    • http://files.ababehavioursolutions.com/uploads/1/3/0/7/130739648/niladiw.pdf
    • http://files.mariepoza.com/uploads/1/3/1/0/131071057/8232186.pdf
    • http://files.siamdetectors.com/uploads/1/3/1/3/131381480/e5a3e83.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/28333084373.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/98506328819.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/mitokovuxato.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/25220884885.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/moveditumovovagenixij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/gabuzawudab.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/kumaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/kurokivunige.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7670/files/82603976978.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/tojamixosajozedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/zazenazisinunokegixiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/70843735589.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/veteramamibete.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_off0000bd43.bin
22c2e7b74dc2cb5ccedd23bcd2ac9ddf61a54e40b0413e22c060e43e804d6032
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 4836 bytes
font_01_sfnt_off0000cdca.bin
0cd28bf784c01970603577be889462a02c7196a499550a41da916897ff5628e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 10096 bytes