Malicious PDF — malware analysis report

Static analysis result for SHA-256 39469b9a08f7134a…

MALICIOUS

PDF

45.6 KB Created: 2020-08-05 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a745440e11da4b6caebcdcd3d51b662 SHA-1: 5afbe7773bbdfb9bd2f9af7c79d602306057089c SHA-256: 39469b9a08f7134afc8f04dc7cae063d1aa5b20194c4a89851178dd5e4baa73a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to 'Istio tutorial pdf' and mentions wkhtmltopdf, indicating a potential lure to disguise malicious content. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wb?keyword=istio%20tutorial%20pdf
    • http://files.greenrockswarmbloods.com/uploads/1/3/1/4/131437689/7a97ee9.pdf
    • http://files.topapta.com/uploads/1/3/0/9/130969048/pafutepo-tafapaxodo.pdf
    • http://files.annapicklesharvey.com/uploads/1/3/0/7/130775590/6139294.pdf
    • http://files.pyonkotchi.com/uploads/1/3/0/8/130874613/7953906.pdf
    • http://xizixin.laurasarts.com/uploads/1/3/1/6/131636719/nikobitigew-bavolomitixomez.pdf
    • https://cdn.shopify.com/s/files/1/0436/0051/1138/files/9212837460.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/news_broadcasting_script_english.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/70533840920.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5047/files/kabbalah_black_magic.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/quality_control_in_hematology_laboratory.pdf
    • https://cdn.shopify.com/s/files/1/0438/2821/5968/files/biochemistry_of_cell_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/divixijadokexiriwolufoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/235751122.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/what_does_crack_smell_like.pdf
    • https://cdn.shopify.com/s/files/1/0439/3651/4216/files/70775632927.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/steam_workshop_don_t_starve_together.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/zeguninabaganerudi.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_off00007539.bin
daef2daaf9d225d7c63114977cfe7768d5440e323beccfbb4a0470859952eac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 4972 bytes
font_01_sfnt_off0000862f.bin
100ff98ddad7b6c60409fa16a188912022785338b00c45714195afbce00913b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862F 10352 bytes

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