Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cd0b819d23833d…

MALICIOUS

PDF

49.6 KB Created: 2020-09-03 00:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17df5f9f4c048335fb04d74c543d9fa8 SHA-1: d73ca8197cc200bf7c068bf01443bde21fb64854 SHA-256: f8cd0b819d23833de7956004abd0d2bab3d7d6c9db6eb6582c593c8bd8f6b664
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=beamer+lightshow+software'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://cdn.shopify.com/s/files/1/0435/2622/6075/files/bleacher_report_football_predictions_nfl_week_3.pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its direct lure, but the presence of the malicious redirector is a strong indicator of malicious intent, likely for phishing or malware delivery.

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/wix?keyword=beamer+lightshow+software
    • https://cdn.shopify.com/s/files/1/0435/2622/6075/files/bleacher_report_football_predictions_nfl_week_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/451272197.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/89447904513.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/populate_form_from_database.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/bf_skinner_theory.pdf
    • https://static.usrfiles.com/ugd/64f9d2_64b0dd2417ee4a9b9663be1c593382ad.pdf
    • https://static.usrfiles.com/ugd/f0f215_5ccdf69e373947ea8b0a1a79242a24a3.pdf
    • https://static.usrfiles.com/ugd/b910ae_d292e6e4a5ac4a1ebbcb35f6cffe58cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_46ba6182436e4eddb7f5e135cc2b47a3.pdf
    • https://static.usrfiles.com/ugd/d4579c_10a798b0c75b4a95b68b618149599647.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_3e6262897e40466ca8241f81715e4e1e.pdf
    • https://static.usrfiles.com/ugd/bcc0e4_576b7e1124a74500a6895c3bbb273d3b.pdf
    • https://static.usrfiles.com/ugd/2074c9_78d53a0390784d60a8326499b07dcd8c.pdf
    • https://static.usrfiles.com/ugd/6290de_6186b6e8fca94e92b3451bdc2d9fe83d.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_off000082e5.bin
9faff2e20702bef398e650b40a3a5d7b06acd13207ba99a523300f9189a77ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 5320 bytes
font_01_sfnt_off000094e0.bin
49b4b32f7501e8af679ef2e11a47848e334cc246e091d0007550aeb63d66e9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E0 10768 bytes