Malicious PDF — malware analysis report

Static analysis result for SHA-256 59432342100ee887…

MALICIOUS

PDF

50.0 KB Created: 2020-08-31 14:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a0d1f794d4a1a299ba143825b1a75c SHA-1: 6a245859317fd4be5af8dca3fa0c79d1d8346df5 SHA-256: 59432342100ee8877678d70d99c197cbb6f007447641241426baa7cc801b67cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=sql+server+dba+interview+questions+and+answers'. The document body, though heavily obfuscated, appears to contain this same URL, suggesting a lure to trick users into clicking malicious links. 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/pify?keyword=sql+server+dba+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/b8c837_ebaa5da43e824dd68ca5ff8a5f2a29fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a0d77b368d467cbf1d346bdddbaac8.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbafac0e7d174d3388260a72d41f770f.pdf
    • https://static.usrfiles.com/ugd/09c3c7_e2799c746d1c491cb66d454fe31953d7.pdf
    • https://static.usrfiles.com/ugd/5ed537_b62af3ed6818457f9c4f28464b171f00.pdf
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/chhattisgarhi_song_karne_ke_liye.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4657/files/77095095922.pdf
    • https://cdn.shopify.com/s/files/1/0435/6656/3487/files/spelling_diagnostic_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/wonibipuvobowudarobu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/16289121926.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/12490692141.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/kutaluwegesizokuvowure.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/wamajonikivirolitowibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/14159780541.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/27492046571.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/69847026114.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_off000077ab.bin
f899869b8d637bb3824b24cac15b49bfbc8a42beea36dd4b9612ac3a89d28962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AB 5224 bytes
font_01_sfnt_off00008981.bin
0c3f531eece5871b9bb6167eb40e1075eebc0ef8234a1b45ea655e9ef2b4df7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 10388 bytes
font_02_sfnt_off0000accb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACCB 4324 bytes

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