Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ccf4d3069862e2…

MALICIOUS

PDF

47.3 KB Created: 2020-08-29 20:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de029e6427d2a35a3d2772ff42b4b597 SHA-1: 37d261948c1c189dd8602f4aac2e7a5a0137c364 SHA-256: 21ccf4d3069862e28d74d37e52476bc4418f0a419a8343611b89c722ac920e41
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, identified as a link farm. One of these links, 'https://ttraff.club/wix?keyword=relaciones+toxicas+en+la+familia', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, suggesting a lure to a malicious site.

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=relaciones+toxicas+en+la+familia
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/computer_based_numerical_and_statistical_methods.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/wipuketopomuzozex.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/book_creator_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_47cf9e6eac244b3f9003590006603f2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_90fcb2153c0c4348be5e14905b17cfb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a60fd1361b84521a6891fcd4932acbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_38493757649841c7a5b34681288a6b9c.pdf
    • https://static.usrfiles.com/ugd/4b68be_7943a48bcae84df3ade9f000bfb5fc7c.pdf
    • https://static.usrfiles.com/ugd/60933b_1872424a515f433782704189232d30d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f9b1f3727c49e0a214c508011206bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b35804b4e1b42b0b027bcbe58865553.pdf
    • https://static.usrfiles.com/ugd/b8c837_d090bb308f51431c84846676e81c1668.pdf
    • https://static.usrfiles.com/ugd/63d3ad_0399c3fd262f43939bde44cbefe89ab4.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_off00006d69.bin
5a49aa885e0511b8e6e16887a520cb2d963271a6fa81cb6edfccbd0626cae8c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D69 4792 bytes
font_01_sfnt_off00007da0.bin
9b589f0d8c3770736e4c1fe68aec59e2f7312553e4d958def73fa12f8f5d1b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 10960 bytes
font_02_sfnt_off0000a0c5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C5 4324 bytes