Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec197bf05af1f2b2…

MALICIOUS

PDF

38.7 KB Created: 2020-09-02 00:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d010a4f839c0865734af8779b22a75b3 SHA-1: c4a35a49ecf4335ea86af6510addf330b7c7eae5 SHA-256: ec197bf05af1f2b286ccd213a9ead2371daa691641bfdf066260adc1e96185a0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a known malicious redirector. The document body, though partially obfuscated, contains the same URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=keeping+score+dan+and+shay+sheet+music
    • https://cdn.shopify.com/s/files/1/0449/5500/9192/files/aiag_spc.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/47379456135.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/alter_ego_4_vk.pdf
    • https://static.usrfiles.com/ugd/b8c837_9589c71ba4a94a61961b9f4a1185791f.pdf
    • https://static.usrfiles.com/ugd/08fe48_db4bcdc3595d46548a88383b0bae0117.pdf
    • https://static.usrfiles.com/ugd/69695d_dc0dec4eba974b65b40d5284cc457006.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae0e9126a33546a8a2ba2eddea92654a.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb335737a47b4a68aba77d7ba136fa2a.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/22958590906.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3047/files/fowuvosikijufof.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_off00005944.bin
dcf4ff05a7d509c49a165322f5be992ef064331d5d82f178cbe3d7b35c7f1c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5944 5528 bytes
font_01_sfnt_off00006bf8.bin
56a896ede37f8d944e97d527542d83e6b86cf7d12a951ae68c5ac6109ee90c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 10128 bytes

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