Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88f08aaaa3e5173…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 05:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d027f269d0291f276bc625e6c5f0318 SHA-1: 203b320aa575d3533f92260f84dea832ffb33bda SHA-256: d88f08aaaa3e5173dd2662a0d32dca35cd7d9a4cdc8e98c88918ec758c89d0c1
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=leche+y+miel'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the conclusion that the primary intent is to redirect users to a malicious destination.

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.club/wix?keyword=leche+y+miel
    • https://static.usrfiles.com/ugd/b8c837_c18b00c48a9442daa5fa71755ec620f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c263528a7c924f2cafb1adabde3828a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b8697ee309d48c9b1c8779998d8d11d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8142de937284c0bae0337000f31f25a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f5ea33ec6564d908efdff587d342b03.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/60450299279.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/mezukoxetijadem.pdf
    • https://cdn.shopify.com/s/files/1/0429/4869/0076/files/75885366583.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/26616313264.pdf
    • https://cdn.shopify.com/s/files/1/0437/5648/6807/files/trastornos_alimentarios_unam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/86940658240.pdf
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/64868154348.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/14159166874.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/alteraciones_del_lenguaje_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0626/files/suzijut.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_off000069bb.bin
723b3cc04d8db5df4a5ed45720726acfb6891ac77b751108f07bc1ff824888b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 4596 bytes
font_01_sfnt_off00007948.bin
45deed11b05bdac42da623b100598cbb5fac8b4f2d74f8cd6ae64ed57609daa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7948 11420 bytes