Malicious PDF — malware analysis report

Static analysis result for SHA-256 941bddc754155ee2…

MALICIOUS

PDF

55.5 KB Created: 2020-09-06 22:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1113a82e8aec87227d8cc3c0ccf992af SHA-1: ccdacb396144d5b31c6133ab59a28d3074c5c315 SHA-256: 941bddc754155ee22bee6e20ead5b53f85347588a70e71826054de079e9f9131
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or spamming activity. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the title 'Absolute location and relative location worksheet' and the malicious URL, reinforcing the lure. No scripts were extracted from this sample.

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=absolute+location+and+relative+location+worksheet
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/61475886511.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/batman_the_killing_joke_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/63879169296.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/35770483270.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/pdf_compressor_mac_software.pdf
    • https://static.usrfiles.com/ugd/880a7e_3b13cf5854ac47639e898066a0acc8e7.pdf
    • https://static.usrfiles.com/ugd/135178_2dfbaa89a8584e48a2b0bd99e41f040b.pdf
    • https://static.usrfiles.com/ugd/ddb60a_49ce717c7b064d6fbc784fdcafc51315.pdf
    • https://static.usrfiles.com/ugd/b8c837_45aaa70368c748eabbcd910d550aa9b3.pdf
    • https://static.usrfiles.com/ugd/760101_7db9fed78c0641679dee3352c2c35c89.pdf
    • https://static.usrfiles.com/ugd/108936_eef07261f8e843e6ba38677cd9f3c7f9.pdf
    • https://static.usrfiles.com/ugd/3be3a7_523e3bd1c9c74328a5ae4db021c40382.pdf
    • https://static.usrfiles.com/ugd/4a6c57_02859371d4564bdcb1deab4f00ae51ea.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/party_itinerary_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0457/6618/1028/files/coplanar_waveguide_vs_stripline.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/rarawizir.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/difference_between_bailable_and_non_bailable_offence.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_off00006cdc.bin
4822087755a973476e265a8d1805bb21e7b5648acfe872101f8a8bfb1efcd28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 13184 bytes
font_01_sfnt_off00009760.bin
cf7d67d710860049b94ed9017879ed648e5dc2372220cd073e9b15f65ab74aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9760 5372 bytes
font_02_sfnt_off0000a9b3.bin
f80710a0037ba5a3a531b9b408390ce4d304c96a3065f9de37372490b4fc00c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B3 11612 bytes

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