Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcafbb544e0e918a…

MALICIOUS

PDF

49.7 KB Created: 2020-08-19 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d496dce742914ac9236ce3af7462c0 SHA-1: a9b7f93f3684de56f5d9f6b709f4e9c9f0a57a85 SHA-256: dcafbb544e0e918adf1f658624331a0cc917717809c7de9054a71376134b3a30
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'mail merge with pdf attachments word 2016', aiming to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.com/pify?keyword=mail+merge+with+pdf+attachments+word+2016
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdf
    • http://wewimo.cityofmcgregoriowa.com/uploads/1/3/0/8/130814328/niban.pdf
    • http://petobegex.jannicascookies.com/uploads/1/3/2/6/132681409/ratipekikoxusegel.pdf
    • http://xevosujo.mygrapplingvideo.com/uploads/1/3/1/3/131398091/bomera.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/1580531416.pdf
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/jurojenawekabitowil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/voxisukaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/the_anglo_saxon_chronicles.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0326/files/fopofokebazazaxek.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/286681493.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/98050764859.pdf
    • https://cdn.shopify.com/s/files/1/0434/2713/5640/files/38851138288.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/wexekuteviteravisurubegij.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/business_analysis_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/35415295512.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/appraisal_form_1004p.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/jojupegijig.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_off00007abf.bin
478d95c7b5a1936f8f6769956fbd39d9806d8d2de8ff9ee94911a83efcabbc49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 6148 bytes
font_01_sfnt_off00008f9a.bin
97bada296bf2efedabf8a643f797253622aa7747818288f44166708f936e9b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9A 13088 bytes

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