Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8a64e6ed4f40a1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 16:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f5e86d79aeae0970d33d036122e45f SHA-1: ff35fd4fe273380ca7a67fc6914b963eac0601ff SHA-256: ac8a64e6ed4f40a12fe8820671461ea0702740e3ceee3f9effe71898a4ed38a3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or a method to obscure the ultimate destination. The primary malicious URL identified is https://ttraff.cc/wb?keyword=microservice%20architecture%20c#%20pdf.

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.cc/wb?keyword=microservice%20architecture%20c#%20pdf
    • http://files.tetzlaffmusic.org/uploads/1/3/0/7/130739430/gelotuzizukuz.pdf
    • http://files.californialightingconcepts.com/uploads/1/3/0/7/130740568/lawemugevix.pdf
    • http://files.championsworship.org/uploads/1/3/0/7/130776381/bewadonazamarel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3432/8735/files/ayatul_kursi_full_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/13475332900.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/72676523106.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/4292204602.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/kudezowunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/niwapekiwuripeximuburi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/suffixes_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/zizevilidelafano.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/mabalosutetefeji.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/aditya_hrudayam_stotram_in_bengali.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_off000068a0.bin
d4343ead5060d624cb2822b0790bf7abec420099e76aab403c0a69e64480619f
pdf-font-stream PDF embedded font (sfnt) at offset 0x68A0 4920 bytes
font_01_sfnt_off0000796a.bin
a50994a22eab582eb443526f13998592e8ad4bf32f5a00082f875fce2c7d8152
pdf-font-stream PDF embedded font (sfnt) at offset 0x796A 9920 bytes