Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b37e6570e4b0d9f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-30 21:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe4e912905fe40a2fdfb4c80be13676 SHA-1: 1b76d0e0380f4d16ffd8cc28f825315c71f00dda SHA-256: 2b37e6570e4b0d9f44702a31efd0a2e3a75c20498f654c6ca4a4673e10a65df7
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it's a redirector link to malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains. The primary malicious URL identified is https://ttraff.cc/wix?keyword=phpbb+bbcode+youtube, which is likely used to lure victims into clicking through to a compromised site. The document body contains garbled text but includes the malicious URL and several benign-looking Shopify URLs.

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.cc/wix?keyword=phpbb+bbcode+youtube
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/12067142692.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5682/files/pdf_to_jpg_converter_freeware_offline.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3345/files/bsa_physical_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/74718026426.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0946/files/75041980480.pdf
    • https://cdn.shopify.com/s/files/1/0456/8478/5311/files/20179182555.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/ruropuzonimapifum.pdf
    • https://cdn.shopify.com/s/files/1/0450/8496/7077/files/98851086989.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6403/files/adp_ipay_login.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/main_causes_of_unemployment.pdf
    • https://static.usrfiles.com/ugd/6cfc61_522708c2207345feba86c523e918e7b4.pdf
    • https://static.usrfiles.com/ugd/a467d2_b5baed91e272423ca4bef61df9d3f8fb.pdf
    • https://static.usrfiles.com/ugd/d775a9_43146cf2f1a1402aa471069d26d3c01c.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_7ab771c891bd4d9280951f6d75209744.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c6.bin
03862ab6a6272a721a22879fb3066833c3c779272527c5ee2614be689c6f0bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C6 4616 bytes
font_01_sfnt_off00007476.bin
00c06d814ae8b426f43e090bf1eb6a3ba61dd038b1d49e9a107871b0b9d4ed91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 15912 bytes
font_02_sfnt_off0000a5fe.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FE 16204 bytes
font_03_sfnt_off0000bb2e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 4324 bytes

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