Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd863659a5fcf11…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 05:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2439b43820adcb0996f2ff1c362d7880 SHA-1: 2ae398540f16ab3a1182035b1b3c547b4b857a57 SHA-256: efd863659a5fcf11ddb415bd1da52d4a385c4af6ca89bd00677abc19c848d14f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a book search, aiming to trick users into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic suggests this is part of a larger campaign to generate traffic to malicious sites.

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.ru/wix?keyword=sherlock+holmes+sinhala+book+pdf+free
    • https://static.usrfiles.com/ugd/cc03df_508afc9d32af4ec388c650a2f09c356d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c45884a71143b18055d956689e6f83.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e801cfe74ae4804bee56ed40a5a27b0.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_62564f8345c24cecb2f86c52626c4856.pdf
    • https://static.usrfiles.com/ugd/f3cb45_0b9388d52c974b1985fc5a2f5b45b2f5.pdf
    • https://static.usrfiles.com/ugd/286fb8_8a3ac04cd716432ca8685c7864339bd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf52e3c9035c4fc5ba97cdc78f330aad.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d5abccfc9204656b8b2e684fdb2f274.pdf
    • https://static.usrfiles.com/ugd/a382ee_d1edf35f9f264c8e997b2cf1584ec4d4.pdf
    • https://static.usrfiles.com/ugd/d1c05f_ae68323e071a4989b53e970999e31e6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_25da434c14cf4d2d94f57eb5210c90f3.pdf
    • https://static.usrfiles.com/ugd/c068f8_9d7689504fae42fda65bf379b9507072.pdf
    • https://static.usrfiles.com/ugd/16a96a_7f94f3b1fd0644839bb5f5b839439670.pdf
    • https://static.usrfiles.com/ugd/15d534_5485e5984bc84f36847423e0691d4e5c.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/acceleration_and_circular_motion_ans.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9357/files/conjunction_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/2341907699.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3158/files/pivafutorogedazakaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.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_off000076c0.bin
cbc9280ead9ce80fdd20eb9504546be213a8dd0d56e38533cf286f98d788c171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 5704 bytes
font_01_sfnt_off000089e9.bin
915c4b72f2db5777bc10690ccdcff128aca71ba468242fb48c8ccd9d86fbe5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E9 11400 bytes

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