Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c16114bcf1aab1…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 08:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312e05d5b8fc2fca8ef2723454e78ff5 SHA-1: fa2c9ca63f8f3f08ca2f4880f2f119638887913d SHA-256: 52c16114bcf1aab104fdd773550b17d1d51b4101273a42fad7caf7da3eb6d792
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1059.001 Command and Scripting Interpreter:PowerShell

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF. 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.cc/wix?keyword=yugioh+card+prices
    • https://static.usrfiles.com/ugd/87a178_cb103282caa244cb844d534b220912f2.pdf
    • https://static.usrfiles.com/ugd/58a813_192f68538c2d44bdbc867381f41433cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0364a0c79614c7c8e994394df21ac15.pdf
    • https://static.usrfiles.com/ugd/b8c837_a869ed50d9514b0c9edd6909e39da331.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_0cd48ca789754902a3a9d1411c1641b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7f8b2e54842298383683189af6eff.pdf
    • https://static.usrfiles.com/ugd/162fe6_7934f5c2ae324ae697223ff2f47a6f53.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/38260913872.pdf
    • https://cdn.shopify.com/s/files/1/0468/8150/5437/files/kasey_kane_porn.pdf
    • https://static.usrfiles.com/ugd/08fe48_7cd6bf134cb948e5894e1d77990a703d.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ea7ea2e5b652463bad88554b2f066321.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cf2c7613964c0698fe4ffd656ea7bc.pdf
    • https://static.usrfiles.com/ugd/efb3f0_25edbfa879084599819b842cc50264b8.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_off00005f51.bin
ff89263b742f716e21f8a3a8ee6edf658f456420e652f61e620ee1a1c4f433ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F51 4960 bytes
font_01_sfnt_off00007037.bin
d0edec9ec0ab71f945c6b63faa716528bd408b94dba4f95e9b8fb38754d626f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7037 10672 bytes
font_02_sfnt_off000094aa.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x94AA 4324 bytes