Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f5cea11af54639…

MALICIOUS

PDF

44.3 KB Created: 2020-09-06 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a6a3c8b2c39434f9f78914ba658361e SHA-1: 595004acc875ddefc516b12a48d10b77b84c1d49 SHA-256: d5f5cea11af54639e2a644a1c31b0836022d393630e362332478cd0dec767c22
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=how+to+hold+fitted+sheets+on+bed'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://cdn.shopify.com/s/files/1/0429/4053/0854/files/act_practice_tests_free.pdf' being a prominent example. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'wkhtmltopdf', suggesting a content generation tool was used to create this malicious PDF.

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.me/wix?keyword=how+to+hold+fitted+sheets+on+bed
    • https://cdn.shopify.com/s/files/1/0429/4053/0854/files/act_practice_tests_free.pdf
    • https://cdn.shopify.com/s/files/1/0457/8276/1628/files/sample_school_lunch_menu_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/4904/1563/files/kibejel.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/39586541986.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/mavabiwonibubitalogo.pdf
    • https://static.usrfiles.com/ugd/15cd4d_8dba45d37af041a9b636004933920ef4.pdf
    • https://static.usrfiles.com/ugd/7598fa_4cfb78d713d546749af780c48a63950c.pdf
    • https://static.usrfiles.com/ugd/361045_e29418dec0274a368e8756b557eda601.pdf
    • https://cdn.shopify.com/s/files/1/0466/5321/0789/files/sony_cd_player_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/mejiguwopujojim.pdf
    • https://cdn.shopify.com/s/files/1/0463/4116/1116/files/astrosage_bengali_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/business_plan_budget_sample.pdf
    • https://cdn.shopify.com/s/files/1/0457/6683/6388/files/wejekikivoluvavaninilakig.pdf
    • https://cdn.shopify.com/s/files/1/0440/0037/9038/files/my_imortal_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/xolenomexesinademexom.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/
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/mejiguwopujoji

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007092.bin
3a9bc3cfbc35b3badb595be8ca246270a307cbdb6b66c10e26d429e91953cde3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 4880 bytes
font_01_sfnt_off00008139.bin
e70b95da93b2beddccdd994e1a1948731181294d2bf7c069d6e41eab3a26b470
pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 10176 bytes