Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f19bdec12d36a8…

MALICIOUS

PDF

53.7 KB Created: 2020-08-07 23:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20bc616453aab365a2d69597c8e71936 SHA-1: 046f9792a7ebc39a1146d9d57aa74890bb1afeee SHA-256: 93f19bdec12d36a86e9cc448b6c4fc8baf30a8a1ecf20d5e77d93e2f1ff1e2fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be luring the user to the malicious 'ttraff.com' URL, which is likely a phishing or malware distribution gateway.

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=bahnw%25C3%25A4rter+thiel+gerhart+hauptmann+pdf
    • http://files.azabpublishers.com/uploads/1/3/2/7/132740836/repifo.pdf
    • http://files.holidaysbythemonth.com/uploads/1/3/0/7/130739779/ginutetaj.pdf
    • http://files.professionalbusinessvaluers.com.au/uploads/1/3/1/6/131637477/6094740.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/pearson_realize_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/55416377781.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/gobibikewoxojaxolatuped.pdf
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/59888346503.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/paduromafob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/40296313748.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/likaxinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/3386392971.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.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_off0000913f.bin
7e0e72b61b1f4e91c59f96ef93f4ab78ab84d2b86b03d360076b34306ea72aab
pdf-font-stream PDF embedded font (sfnt) at offset 0x913F 5652 bytes
font_01_sfnt_off0000a3d8.bin
b7f8f9de67d3b60539984c9af947c5f1664a198620f25cea4976b9d9b6408990
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D8 10884 bytes