Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf46c6f5cbaec8d…

MALICIOUS

PDF

48.9 KB Created: 2020-08-08 17:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3531388b664d62a75d2c754d3be10b18 SHA-1: a65eb69a76b7f10afac0d39e3e7b2e1495b67224 SHA-256: cbf46c6f5cbaec8dea512b7617822988910304456921e60e097834e3cc1d3f3d
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting a social engineering attempt to trick users into downloading further content. No scripts were extracted from this sample.

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=sociology+of+health+and+illness+lecture+notes+pdf
    • http://files.sianharcourt.co.nz/uploads/1/3/0/7/130774990/2639296.pdf
    • http://files.midwesternsales.com/uploads/1/3/2/6/132681690/7467663.pdf
    • http://vozimoti.evrimozgen.com/uploads/1/3/1/1/131164250/pizigonelutuxuvutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/wuvar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/solotelimegozep.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/int_main_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/wumasazutofilakapifubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/luzobuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/duganoveveri.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/44697913807.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/51317369939.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/shindawa_backpack_blower.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/87777497240.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000725c.bin
478be29acd564a1de2d071ba937bbc66b511f95b45841cb6fcaf4f1b56883a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x725C 5504 bytes
font_01_sfnt_off000084f8.bin
3ac26710678c4795528a56dbe3e23c70f201ad220bfc6353ff1cd6db9574e8de
pdf-font-stream PDF embedded font (sfnt) at offset 0x84F8 10372 bytes
font_02_sfnt_off0000a879.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA879 4324 bytes