Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c5420a3552d101…

MALICIOUS

PDF

37.2 KB Created: 2020-08-28 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31272331facbbd9125ac3162a190d08 SHA-1: 0881f300c51dd23731f5a44e62e4f776e67df59a SHA-256: 95c5420a3552d101e027885aef006e3d7cc73a0654f373271e8715997f616615
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=ap+spanish+speaking+prompts', which is flagged as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or lead users to phishing sites.

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.ru/pify?keyword=ap+spanish+speaking+prompts
    • http://files.engageinspireexpectinform.com/uploads/1/3/1/0/131070476/wedaxurebatid.pdf
    • http://files.transitionintowellness.com/uploads/1/3/1/4/131453136/c3818.pdf
    • https://cdn.shopify.com/s/files/1/0452/0201/4357/files/xtreme_vapor_barrier_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/arthritis_diet_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/bunolavisipizegameg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/7697861490.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2865/files/chhattisgarh_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/kuvonugeraxevisin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/xemufaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/catgut_simple_y_cromico.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/52313218728.pdf
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/como_fazer_assinatura_digital.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_off000051ec.bin
5ab4ed5dfb946a6863a524c381d592e4fa026d853ffb7a3a8319ded1cd4cdd42
pdf-font-stream PDF embedded font (sfnt) at offset 0x51EC 5256 bytes
font_01_sfnt_off00006393.bin
13e2e65572cc233bba6058c59a7b57adaded9856b473335767fc8b8651bfb057
pdf-font-stream PDF embedded font (sfnt) at offset 0x6393 10852 bytes