Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f0bcda3b9fc9b…

MALICIOUS

PDF

51.8 KB Created: 2020-09-13 13:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81a895c41dfb0b89d615c4a01e1583e0 SHA-1: 01ca8fc7a3b9e96fdb8c40e4aab4edba230ee8da SHA-256: d55f0bcda3b9fc9bdf2e7e4366ae434f32dfafd1caf0b0341d9c9f5c430130dc
128 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body and the primary URL suggest a lure related to 'CIA job background check' to entice users to click the malicious link. The presence of numerous other PDF links, many pointing to cdn.shopify.com, indicates a link farm strategy, likely to obscure the malicious redirector.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.com/pify?keyword=cia+job+background+check
    • http://files.betterbodiesgympattaya.com/uploads/1/3/2/7/132712000/3189762.pdf
    • http://webuto.sheungshan.com/uploads/1/3/1/3/131383541/namakum.pdf
    • http://puxuda.blacktidefishing.com/uploads/1/3/0/9/130969077/favutojeluz_gavagogove.pdf
    • http://kevuxotot.masonkelso.com/uploads/1/3/0/8/130874359/fatiguvozapaso.pdf
    • http://dujiket.rdcookingschool.com/uploads/1/3/2/3/132303219/womodubezidisafog.pdf
    • https://static.usrfiles.com/ugd/badafb_bfc2de5c8347446ea5e87fa5c06875c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0bf76ed2e9d4340941d420442a5ad67.pdf
    • https://static.usrfiles.com/ugd/83d902_f4b35b46c06342fba1179a66cd0f2d0d.pdf
    • https://static.usrfiles.com/ugd/ee6100_6b97866a61534d1bbde784835741a754.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/95107760848.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/10th_standard_new_syllabus_social_science_book_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/46074651919.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9845/files/bafawapikivewobem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/29333249595.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/aerith_s_theme_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/grow_castle_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2784/files/homebound_status_per_medicare_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0480/9768/9763/files/maytag_mvwc300vw1_service_manual.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_off00008db2.bin
9fa0059bcf32eee65f6cfc77a87e26e554c3d11f2f53a119f1bca1574a5a41ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB2 5176 bytes
font_01_sfnt_off00009f42.bin
ab2c6d5968fda43c39478fa8ac784a812f550fa4be5310b3198c19eeedf58ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F42 10104 bytes