Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d1a35a330bc968…

MALICIOUS

PDF

44.7 KB Created: 2020-08-02 13:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8443898391921bbe6da9570abbbbb9b3 SHA-1: 5ff194f6a8ee309234c9784ab963f9f2ef95081f SHA-256: 55d1a35a330bc9682f1e022e29ef98189d844e61d2c1462d10f2e275ae3bab8d
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.ru/pify?keyword=apple+ringtone+remix'. Additionally, it exhibits characteristics of a password-protected archive lure, suggesting the PDF itself is a decoy to facilitate the download of a password-protected payload. The document body, though heavily obfuscated, contains the malicious URL and numerous other PDF links, likely part of a link farm to obscure the true malicious 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=apple+ringtone+remix
    • http://files.kickstart-hr.com/uploads/1/3/1/1/131163949/detopanibiki.pdf
    • http://files.wow.yez.dk/uploads/1/3/0/9/130969300/950705.pdf
    • http://nofuvufo.shopcatchboutique.com/uploads/1/3/1/4/131438539/ramogipuvurube.pdf
    • http://files.learn-bhangra.com/uploads/1/3/0/7/130775554/7398052.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/puvukinepelorezozelal.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/wudupuwobinenabafav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3432/8738/files/wojararumemelit.pdf
    • https://cdn.shopify.com/s/files/1/0438/2146/5757/files/21402837896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/installing_kong_locally_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/21207503461.pdf
    • https://cdn.shopify.com/s/files/1/0432/4183/2615/files/59894928857.pdf
    • https://cdn.shopify.com/s/files/1/0434/9001/7430/files/puwekiralisobadifutokinek.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/55155839814.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/45646114788.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/97349650314.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/how_to_reverse_linked_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006676.bin
dd30aab97d2e24bc9985e954c563b6c4157b9301a7ee8bfab5f2acda56a5f0c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6676 4596 bytes
font_01_sfnt_off000075f4.bin
1401a5e866b96b822d418459a0881096e5abf05805dbbd447ef457b93cf17b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F4 9900 bytes
font_02_sfnt_off000097c6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C6 4324 bytes