Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac31ba05b4fdbec9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 15:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de031458d86a47e53e8a72d0922b84b SHA-1: ac02710485811f2d26fd8cedd8a20e45d6cc56e3 SHA-256: ac31ba05b4fdbec9d23bb57cce0e2149054f22a626bfcf1bf488caeaf2fa6fc3
120 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.ru/wb?keyword=download%20dicionario%20ingles%20portugues%20pdf%20oxford`. This indicates the document is designed to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are hosted on Shopify. The primary malicious URL is the most significant IOC, likely serving as a gateway to further malicious content or exploits.

Heuristics 3

  • 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.
  • 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/wb?keyword=download%20dicionario%20ingles%20portugues%20pdf%20oxford
    • http://nofumobe.bluemountainrhythms.com/uploads/1/3/0/8/130814174/resatowugerun_maroxiborakafi_juwamewolok.pdf
    • http://files.papasnowmusic.com/uploads/1/3/0/7/130739053/ganaloferenutu_lorezosuv_budelotib_kufogatapukizig.pdf
    • http://files.mykajelinastudio.com/uploads/1/3/1/4/131408798/5139890.pdf
    • http://ganudebe.hootandhollerpr.com/uploads/1/3/0/7/130776445/9057657.pdf
    • http://files.apprazrapp.com/uploads/1/3/1/4/131406430/feac20ae.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/18090855183.pdf
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/zirefaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/45947186414.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/manual_de_execuo_araken_de_assis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/70055180779.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0439/files/caprari_pumps.pdf
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/autoclave_in_microbiology_lab.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/41706156432.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/demalujafudixokevude.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_off00005e93.bin
8fa1b012f54a5b194f26f32724efe25b3d8f8e8414eb35e5a1133279e4dd20c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 5480 bytes
font_01_sfnt_off00007165.bin
484f231404243d03821cf6c8dbb8251b21fc3c76f488d95ba3ee00156fe7b39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 16356 bytes

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