Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6dfa768bde6993…

MALICIOUS

PDF

70.9 KB Created: 2020-08-09 05:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca4ef421a922249dd1875a12c14ab61 SHA-1: 3a54bf03d74e4dc9fdab5d12b0754b9f91ad75c5 SHA-256: 9a6dfa768bde699384f30244bfe2b30627884debbaf7f778a48044f2df435d69
128 Risk Score

Malware Insights

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

The PDF file contains a prominent link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Synonyms and antonyms pdf download' and the URL itself, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or to distribute malicious links. The SE_DOWNLOAD_BUTTON heuristic further supports the lure aspect.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=synonyms+and+antonyms+pdf+download
    • http://files.thevamcommanders.com/uploads/1/3/0/7/130775623/8594934.pdf
    • http://files.densityanalytics.com/uploads/1/3/0/8/130814769/57a960d0c0.pdf
    • http://files.pandgdolls.net/uploads/1/3/1/4/131437319/1ef127.pdf
    • http://danuluv.karishmadonde.com/uploads/1/3/1/8/131871721/barafupa.pdf
    • http://files.artforhorses.com/uploads/1/3/1/3/131380894/6d3de7.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/83684565252.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/xivupuzujigeregetume.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/14559288737.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/rowipewusalewewixugav.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/83796580568.pdf
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/73549554237.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/fusionner_des_fichiers_en_un_seul_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/berikafa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/2926190562.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/california_common_core_standards.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/turexumolojozatosuwiwobil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/74397299734.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/tekefa.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_off0000b660.bin
39a9e8b25cf1dcd15de2d1de623bf060f6fe8b6c94f4d582537c00aa39f3d9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 5388 bytes
font_01_sfnt_off0000c8bf.bin
fe852cad8ea8788710f92288583019b5eda0115eae063bae3232680881d90182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 12788 bytes
font_02_sfnt_off0000f173.bin
7878d9f1ac65c1877d87600920c4f78ac478ef4bb7ef2a84830e7f19ebd63375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 8712 bytes

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