Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b674d2e97c2cbbe…

MALICIOUS

PDF

46.1 KB Created: 2020-08-23 14:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45f3a47c76cd9302c1f4bb6e92e0f1a0 SHA-1: 7c5e5f98c6445d9d00307df47b987483e7310dc8 SHA-256: 8b674d2e97c2cbbea61d422b1ae93d45ce8e62c2d8605a9f3c89faaadf16f536
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The presence of a 'download button' heuristic further suggests a lure to trick the user into clicking the malicious link. The PDF also contains a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the true destination.

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.cc/pify?keyword=email+newsletter+template+html+free
    • http://files.arholistichealth.com/uploads/1/3/1/0/131071063/4946781.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/73916464382.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/pabibumubogedifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/fpsc_challan_form_bs-_17_2019.pdf
    • https://cdn.shopify.com/s/files/1/0436/8714/9733/files/nifaturipazukizewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/vizisifowitaje.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/kinasukewivusurupepegoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/devefabot.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/59294410958.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/51377471106.pdf
    • https://cdn.shopify.com/s/files/1/0433/2922/4857/files/curious_george_story_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/zozabiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/39330333787.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/xejogesufoxumowezuv.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_off00007594.bin
8a6e2ce0490e66735903c267214d7c50a6d3f7fcb9c28ac0d1113ccdebc5adfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 5188 bytes
font_01_sfnt_off0000871a.bin
92eeed44f112fb77a8f5956f864e897d72e8b40e3fafa47d1917fc945788280c
pdf-font-stream PDF embedded font (sfnt) at offset 0x871A 10636 bytes