Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a5bd8aa15ced5b…

MALICIOUS

PDF

37.3 KB Created: 2020-08-05 03:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef88510fae1410ac7d1a1e755eed8934 SHA-1: 295ec41800a8128cbc3b1cec3d2e557ab05b4860 SHA-256: 21a5bd8aa15ced5b2dc9659463d9deb4b9365b476598484703e2617fa0ce5254
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a search result for sheet music. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a link farm technique used to distribute malicious content. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/pify?keyword=westworld+black+hole+sun+sheet+music+pdf
    • http://files.wlcbands.com/uploads/1/3/1/1/131163931/2921846.pdf
    • http://files.tomsimonsonphotography.com/uploads/1/3/2/6/132683330/zomeresuloxali_pewuponewelozo.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • http://files.msdanielledobeleit.com/uploads/1/3/1/4/131454065/sosem.pdf
    • https://cdn.shopify.com/s/files/1/0440/4399/3238/files/lenofovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/popanobetebova.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9671/files/btw_meaning_in_texting.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/37815610404.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/kuzebofupaji.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/64847513074.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/youtube_e4_b8_8b_e8_bd_bd.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/83221764710.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/67801789621.pdf
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/sofakupatepabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/38658251479.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_off000050d7.bin
2d3b0dcee3339fb159c6e0614de7a8c8d9d9576bfb736b836a738e452e9d1fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x50D7 5704 bytes
font_01_sfnt_off0000642e.bin
57266a48a2bf71bf92db9e4ab2c6d1e7834e5b6b6482ceed6bb5fd07d60b799f
pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 10436 bytes