Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d5a608eac450a1…

MALICIOUS

PDF

45.5 KB Created: 2020-09-03 04:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a29be83fac89222cb42b1ee5c328be4 SHA-1: 577175ce54963199519d7b522c8c31e5257a43aa SHA-256: c4d5a608eac450a1529bf1fee5fa37f324121173116b76179aba84b7e1cd5bf4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Basketball game ios' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links, many pointing to the same dominant host, indicates a link farm designed to obscure the ultimate 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/pify?keyword=basketball+game++ios
    • https://static.usrfiles.com/ugd/c1108c_662beb15d28a4de59e4eaa0e4c1d6cc5.pdf
    • https://static.usrfiles.com/ugd/a421e3_76a67887aded42888c1411236114ff38.pdf
    • https://static.usrfiles.com/ugd/f2ef67_e5b8f99fc08049d18e060209ecd8fc8a.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_611f60fd9c944d38904ca6e014ce78ea.pdf
    • https://static.usrfiles.com/ugd/e3834b_4d6aba6b96d548a4aa11de25a0f949e1.pdf
    • https://static.usrfiles.com/ugd/50de67_9e23dd881b1c473388791afff2e2dbda.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c110e82de454fb2bef28a9e1e904a6a.pdf
    • https://static.usrfiles.com/ugd/0a0016_bed020fae787474a8445ccb2c7ad7d47.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/nofurijopirekuw.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/agenda_diaria_2018_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/kedupaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/81332333566.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://static.usrfiles.com/ugd/b8c837_36e48f9db16d4675b41380d0fa17b36f.pdf
    • https://static.usrfiles.com/ugd/73cb9e_020a8fb3ebe2443e9839739355583ae7.pdf
    • https://static.usrfiles.com/ugd/defcb2_4503d4cd57f748d58448ffe53c7a4ab0.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_off00007544.bin
222a0932be8f5f901bc64ce4cd551b3857dcdf36c148f0a7e1cfd8c8928a3075
pdf-font-stream PDF embedded font (sfnt) at offset 0x7544 5160 bytes
font_01_sfnt_off000086cb.bin
9ecdd907d539ceeeaf614b29d21e44ae436c4bb548de47d838887777cc372ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 10032 bytes