Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288595aad70503b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 12:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a76ef5f0781e790984eb5e6c7a5e0d SHA-1: 56cd2ac2b9038f3e745ac823268e160c2581a5ba SHA-256: c288595aad70503b783cdfc52f7c932fef47110fd2ab7be5cbcb5ef676f39ca0
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'shopnotes router lift plans pdf'. This link, https://ttraff.me/wix?keyword=shopnotes+router+lift+plans+pdf, points to known malicious infrastructure. The document also contains a large number of other PDF links, likely part of an SEO link farm, with the primary host being static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=shopnotes+router+lift+plans+pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://static.usrfiles.com/ugd/73cb9e_3ee36679885147889676942a3e5b9c3d.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/a_merveille_1.pdf
    • https://cdn.shopify.com/s/files/1/0447/4263/9765/files/holy_bible_new_king_james_version_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/65714026983.pdf
    • https://static.usrfiles.com/ugd/b8c837_321e63a406674f84b0232b4cc4073adf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a0c8d55a448421a8388470bbb5c2218.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb8f0d6663694b40a20dccc2731d356b.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_033164b99c7b4aacb5ec1b167aa572bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_896d13de34924b1e8fcb7f854960b5df.pdf
    • https://static.usrfiles.com/ugd/b8c837_96b525a2971e46f187e573606558a986.pdf
    • https://static.usrfiles.com/ugd/3eed2b_19fb401064394948ba42ea57b3f24a7f.pdf
    • https://static.usrfiles.com/ugd/e73fea_7f34d34b0e77417aa5495ceda5614ef0.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_off00006251.bin
ef06bfe813989651c50b58ed00b1281f9b207a23195dbbc55b45498787fb19ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x6251 5232 bytes
font_01_sfnt_off00007408.bin
65975d9ba58ac0dfb8bea04591a8ef2db09d9529be0d4730c190c9c912af8c63
pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 10364 bytes