Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a56db71cca9713…

MALICIOUS

PDF

41.8 KB Created: 2020-09-11 07:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa7879fcf3cb35b7a4105fc4375daa97 SHA-1: dd537b6b38f9038c041bf61bf0524381cce7a2e7 SHA-256: 21a56db71cca9713e1d5a9d1a83d30d354ce1ffb8a3cef11df9f0aa3193e9d87
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a known malicious redirector. The document body, though partially corrupted, appears to be a lure for a 'Lomo instant camera user guide'. The presence of a malicious redirector link suggests an attempt to lead the user to a compromised or malicious site. 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.link/pify?keyword=lomo+instant+camera+user+guide
    • http://saliv.netvike.com/uploads/1/3/0/7/130775971/1fee75fa.pdf
    • http://files.holisticvoicecoach.com/uploads/1/3/2/6/132682563/6907149.pdf
    • http://files.switzerland-county.com/uploads/1/3/0/8/130814605/4137097.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/50245656810.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/basic_engineering_circuit_analysis_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/94638498375.pdf
    • https://static.usrfiles.com/ugd/0c4177_452b4c10132a4751ac3f1da41847a491.pdf
    • https://static.usrfiles.com/ugd/baa514_ed994712562c4a95aef6269ce4e5fe61.pdf
    • https://static.usrfiles.com/ugd/0d2fda_813e40465512446c9804ed7a9d04521d.pdf
    • https://static.usrfiles.com/ugd/8ebb60_ae2c811dbaa14549a3f7711a5df1b629.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_off00005f2b.bin
c6fac300546b3b726199d371abc02f9b75942734632037bafe47849ac81e5967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2B 5168 bytes
font_01_sfnt_off000070a6.bin
955fff927ef1600597b16b6e13554738e25c77e5bc6f612dfdac30a24c1fb7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 13248 bytes

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