Malicious PDF — malware analysis report

Static analysis result for SHA-256 434bdfb6f32f9f21…

MALICIOUS

PDF

39.5 KB Created: 2020-09-01 06:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c9e14d08cfe2c84186b3ec30afcad00 SHA-1: faaf0ae178117ef593c33a40e6ef5826e7f72547 SHA-256: 434bdfb6f32f9f2161210366dcc95a6dda4920dcb0330612cd056c675dd4a0be
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'https://ttraff.cc/wix?keyword=bluestacks+app+player++windows+10', suggesting a lure to download potentially malicious software. The document body, though heavily obfuscated, contains text related to 'Bluestacks app player windows 10' and the PDF creation tool, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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=bluestacks+app+player++windows+10
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/kogudabupokupizej.pdf
    • https://cdn.shopify.com/s/files/1/0430/6996/4439/files/op_amp_circuit_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/dram_broccoli_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/visupolirimaf.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/bash_rename_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/85103837876.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be36ac1631b4b15bfdcc26c2d20537c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc34efc87aa42328f72b61516303866.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/hindustan_amravati_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/cristianismo_puro_e_simples_baixar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/gakisefivusaxij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/detunapunosapu.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_off00005d33.bin
f99f40ad230cc0cfd34cec05468849cf3c1e36ccf3d6e131bac391aa2a694a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D33 5568 bytes
font_01_sfnt_off00007055.bin
3fd961ed3b50c91f4324cc768c4b4d7001a9505ad608941431b7df0e32cb687c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7055 9704 bytes