Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b28f1ec57badba3…

MALICIOUS

PDF

53.3 KB Created: 2020-08-30 13:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ba70692b82c0ea39c38ef64200bb9b SHA-1: bee4bbcc110be65dae8dd5d3e9c2e302189431c7 SHA-256: 4b28f1ec57badba32dd1be08f25af261455acc15c391f4862bbfd6d2b69e027b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=immoral+memory+the+lost+memory'. This indicates the document's primary purpose is to redirect the user to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious URL is sufficient for this assessment.

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=immoral+memory+the+lost+memory
    • https://static.usrf
    • https://static.usrfiles.com/ugd/b8c837_0de82c59e5914d0a97f4cb3f40464daf.pdf
    • https://static.usrfiles.com/ugd/b8c837_71fcdbe143094fb2ae435bf137c00ca2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3631edaa9a6d474ca5ad62975c84114c.pdf
    • https://static.usrfiles.com/ugd/b8c837_45aaa70368c748eabbcd910d550aa9b3.pdf
    • https://static.usrfiles.com/ugd/cc10e7_01a43ba4ceb344ffbc1589e2ad326ea3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2b96ae9efea49cda02753a74a29d5b9.pdf
    • https://static.usrfiles.com/ugd/c20ea7_d1190b59bc4e482888a5fae318e2e7bc.pdf
    • https://static.usrfiles.com/ugd/f46427_c68216402d534103962f93dd558cffff.pdf
    • https://static.usrfiles.com/ugd/de02f3_8e338d31824849af9be7b96385c6d22f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0893b9117fc24951aa6f7b0ce4139260.pdf
    • https://static.usrfiles.com/ugd/e1d12c_af6061a0c43245b583b20fc999faf188.pdf
    • https://static.usrfiles.com/ugd/510a18_1b2deafcde264b07a2e7e560f2237f55.pdf
    • https://cdn.shopify.com/s/files/1/0431/3035/5866/files/carnal_souls_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/algebra_2_mcdougal_littell.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006da2.bin
4aa147239fcbe5ac88146becf7cb537274fd2730c08e4ea354c14e969d310d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA2 11744 bytes
font_01_sfnt_off0000941f.bin
2bfa2f0710996f87e941fe3fb685b0a135b1aecc8b3dff49201fcad8e5fc20b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941F 4964 bytes
font_02_sfnt_off0000a4d7.bin
564bd7b51c47d504aef58d9860a43a78e528358423eb3482fcb0cc1e3e884779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D7 10176 bytes

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