Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c9a4d09dc7394…

MALICIOUS

PDF

46.7 KB Created: 2020-09-19 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef1962cb36950125241b3daa2bbfdf68 SHA-1: 035a023520a317a1c6e2a2410d76c1362e813559 SHA-256: 421c9a4d09dc739490e998fe9fd7576995629eea0d738ed38389919b2b348939
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=download+vlc+apk+old+version'. This URL is presented within the document body, likely as a deceptive call-to-action to trick users into downloading unwanted software. The presence of a large number of external PDF links also suggests a link farm, further supporting a malicious distribution or phishing attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=download+vlc+apk+old+version
    • https://4da2887f-3a24-464c-9de0-7ed141be12d9.filesusr.com/ugd/0f9ef0_01f8dc8da779498d85494a9917f6f575.pdf?index=true
    • https://8cdb3f87-e5c7-4b91-80c9-732d94dc34f0.filesusr.com/ugd/865d50_2b37afffb5c0421c97b3ff1a180f4ebe.pdf?index=true
    • https://8d1ed59d-3243-4497-990a-52a24a817fc8.filesusr.com/ugd/ae059d_372047a779a74c019e95a63006e32cef.pdf?index=true
    • https://106f2835-20d4-42e6-a1ca-d94a562bcb32.filesusr.com/ugd/05301a_12c3c4e336cf43c395e2496daaddff09.pdf?index=true
    • https://65e4b163-364d-4dc8-9086-2aa3d2eb30ce.filesusr.com/ugd/9b7d8a_e6059f130bbd49ceaab6ee9ed778a4d6.pdf?index=true
    • https://011a8b30-2deb-40c8-a7bb-1f50679230f1.filesusr.com/ugd/011e4b_600416cc814242e1b0424cba2c5e36a2.pdf?index=true
    • https://84f8176e-aa6c-4c17-88a0-57c7d587d0d8.filesusr.com/ugd/d6af85_4c9352713f8444b5ac3d15e04eeb60f9.pdf?index=true
    • https://aa39b9f9-7a14-498f-99c1-cdea55116510.filesusr.com/ugd/37987b_d4fb5e3a2ad845b5a3f6b8d06b020865.pdf?index=true
    • https://9ae4626a-b965-4ddd-ae80-61b25f19d481.filesusr.com/ugd/7921d2_1f245adab07647acbced69607414deda.pdf?index=true
    • https://e04ffebf-9997-46c1-999e-74076e59632b.filesusr.com/ugd/4b874d_dbb457a1fe0d4d5794ef0a1a14c4df94.pdf?index=true
    • https://9c4b6c77-1401-4e92-817b-f1b0b8c90019.filesusr.com/ugd/3f2390_5e4ba6a3a85b4bceb14530390a4d29e3.pdf?index=true
    • https://5e104962-ddc6-4a15-8240-b9ce8c1950ba.filesusr.com/ugd/409ca8_41050e309c4d465b87d896fd195b962d.pdf?index=true
    • 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_off0000776e.bin
64cc84e60fe18c3f1684d49e47862265908fa30a5d81dd8e56f16a956d206b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 5284 bytes
font_01_sfnt_off00008996.bin
2cc604abc931131b867ae6e74be89620d500d4319f7d5ff38ea712871c8bd7b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8996 10640 bytes