Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a9ab430756d1dd…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 22:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae2788a2c16ac4cf7acd3e9129817a4 SHA-1: 8794542e7b363e250f2797bc1867fefbea5f7284 SHA-256: d2a9ab430756d1dd898b3370d967494f7e6583cbf92d7bfdf9c9001ecf9b5547
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a 'Walmart community grant application' and includes the malicious URL, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous external links, further supporting the malicious intent.

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=walmart+community+grant+application
    • https://static.usrfiles.com/ugd/b8c837_139a9c5d3b4441b29ca999ea5cdc596e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5277eca5a5074731b7d767ee6dcde841.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe1b721c1b7141eea5c30b810f1c35d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceddf993e4b54ec79a7a96f85822c09f.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/libro_aprendizajes_clave_tercer_grado.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/fazafuwam.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/tepavimaxenogem.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/wrmbildkamera_seek_thermal_compact_pro_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/basic_english_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/vosonep.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/974817563.pdf
    • https://cdn.shopify.com/s/files/1/0433/8748/6358/files/sublime_for_mac.pdf
    • https://static.usrfiles.com/ugd/b8c837_f503b5c295b648b19252197c58d0108e.pdf
    • https://static.usrfiles.com/ugd/d94ae5_e8e4aef71e164fc79b328205e41c9e0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d93ccf096491447aa97b0d0e689b4e90.pdf
    • https://static.usrfiles.com/ugd/c068f8_60c697bb4a29468d8d8012219599d396.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f5bba800ccd4f6a971630877d8a7326.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_off000071cc.bin
054021532b48b813dbdfd6f4c55099f6904a0f9c8ce190cbbb7592275e95bf8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CC 5192 bytes
font_01_sfnt_off0000836e.bin
6e900dede9778bc6eecdde18c87264c8bcf8e606fec2c975a06e99b1fdab1465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836E 10528 bytes

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