Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ff5bfaa511f07e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 16:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0796334c832140057c5307dea366fc0d SHA-1: c3444291ecd1c207b9476c0d9b839d541a99fd10 SHA-256: 93ff5bfaa511f07ee3983ef25312aa6661fcabf8e839769c1c44670aa4d75f84
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.ru/wix?keyword=drawing+books+cartoon. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=drawing+books+cartoon
    • https://cdn.shopify.com/s/files/1/0437/8876/3298/files/vocabulary_test_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4585/files/minecraft_indir_zgr_grgl.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/kanodinu.pdf
    • https://cdn.shopify.com/s/files/1/0467/7877/7753/files/zikiludaxemuxol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/fire_emblem_mystery_of_the_emblem_r.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/xipejedovuzopofi.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/2e16aa_996ebbfba6e04dd18fff081000200731.pdf
    • https://static.usrfiles.com/ugd/63d3ad_1e962ca2104a4d0c8130d6e2d64454aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_869ac493c09145dba22f0521491ed8c5.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_off00005e07.bin
3102581723127f3f7fffb7a0dd95d31ac58cff5bcdc91263b356fb013e6378de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E07 5232 bytes
font_01_sfnt_off00006ff1.bin
1d64c18748e96e581ba9b0d45d08529dacb8b9c4b561d19b89a00b3cc8f7d6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 9884 bytes

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