Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c40dfed8b3ae7d…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 19:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7515b7e5de0d38341170f1291643eac SHA-1: 9256af258a42729a0d4549748614d8057fe4c231 SHA-256: 97c40dfed8b3ae7d562d3ae8f06d1814f14d8ed0e3b08228bf88e47a9a225ae1
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a heuristic identifying it as a PDF link farm. One of these links, https://ttraff.com/wix?keyword=android+application+for+booking+hotels, is flagged as a malicious redirector. The presence of numerous links, including the malicious one, suggests an attempt to lure users to potentially harmful websites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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=android+application+for+booking+hotels
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/16782844444.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/ammonium_hydroxide_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/mogemupaxinige.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/68392092561.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/86017145660.pdf
    • https://cdn.shopify.com/s/files/1/0434/7926/9541/files/obesidad_trastorno_alimenticio.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/loxigujuzevokoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/inserting_watermark_in_document.pdf
    • https://static.usrfiles.com/ugd/0a052f_1fbc6a4115c9466198efa59aafd91f8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_25bc10c4aeab49bfb623038ca7ad96a6.pdf
    • https://static.usrfiles.com/ugd/40512e_98985cda358c49d4b9036d74d8ca16fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b5e88116df490986064869769db061.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_off00005e51.bin
b85da2133e8d19407ca6522ab4d9f4ae4090f985509aaaf1c772f2e411cc8e34
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 5612 bytes
font_01_sfnt_off0000715d.bin
83d9400b090f95ad23afb0d22213b67e59f91d9a74cd04bccee36d8000a6d58d
pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 9764 bytes