Malicious PDF — malware analysis report

Static analysis result for SHA-256 a191a8bb4eb01f86…

MALICIOUS

PDF

50.5 KB Created: 2020-09-17 08:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3094bb8f14656ec1120eaf391465a73c SHA-1: 2c03b959ca84a5800e70d5a4b80fcba5f09ae8cc SHA-256: a191a8bb4eb01f8641d0970ca9a33c217872f2087ccf260d8aeca8c8ea10c0aa
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a link farm containing numerous external links, including one pointing to a known malicious redirector. The document body, though partially corrupted, contains metadata indicating it was generated by wkhtmltopdf and includes the malicious URL. This suggests a social engineering attack aiming to lure users to a malicious site.

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=taming+the+tiger+within+pdf
    • https://c7572986-629a-4572-8705-a51a45add9f7.filesusr.com/ugd/d5cf39_ada1c2cf836d43ddbf22fac0c3457c8b.pdf?index=true
    • https://aefbbdbb-7933-4922-a551-9d0da9b0b8e9.filesusr.com/ugd/0a052f_7790c3f865a445e4a2d47e72d965912f.pdf?index=true
    • https://23db09ca-467c-4304-bd28-b032b2c9f010.filesusr.com/ugd/c33f71_2f3a8ad193fe483cb8f57ccaa6ea5b31.pdf?index=true
    • https://c9e9afa8-b382-4237-a98d-2af0383848be.filesusr.com/ugd/f91cf1_5ca041585a3a40e296848842b6c85f08.pdf?index=true
    • https://d9cdd732-778e-427f-9cfb-46758ec99a64.filesusr.com/ugd/610d21_4f46ec9454144a0d9e81e5108e9efef9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0462/2693/1863/files/49804075071.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/mexisatozorebitaxutigude.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/xavaxijosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/nawuwifumagaxavivam.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/masajumunilugijatusa.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/robuvexolex.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/38083666035.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/71966258549.pdf
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/cholesterol_lowering_diet_plan.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_off00007b4a.bin
207c84fab709728f1b9049387d01b87b4de413f2a8aabdcec60a9c4ce4a513c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 4964 bytes
font_01_sfnt_off00008c03.bin
ac2fc052fa72c19483e6bb7f36d17a81ac3c537c4a5c0c2249572ce12a66c0c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C03 10252 bytes
font_02_sfnt_off0000aed4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED4 4324 bytes

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