Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ed571e9c081bc…

MALICIOUS

PDF

67.4 KB Created: 2020-08-23 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efcb5f99ee94050b14e627b68e775bdd SHA-1: 7b2d99234d6a6f4c9fc261fa009f664f383a7df9 SHA-256: 8f8ed571e9c081bc67a932767da60f8f4689c71390721c71c8a317e612140a37
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, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains the text '15th finance commission report maharashtra' and the malicious URL, indicating a lure to a potentially malicious resource.

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.cc/pify?keyword=15th+finance+commission+report+maharashtra
    • http://begariza.writetime4him.com/uploads/1/3/0/7/130738554/kinejaxuro.pdf
    • http://files.yehyehs.com/uploads/1/3/1/3/131380777/wofivigefolebuxa.pdf
    • http://files.recoveryspecialistsinrome.com/uploads/1/3/1/6/131606431/6cd3705265405e0.pdf
    • http://files.mi-passion.com/uploads/1/3/1/3/131398358/26066e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/77655303948.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/93598475632.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/joxobogizulol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/garixubogedanu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/mubut.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/supup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/acnl_hair_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/44113054070.pdf
    • https://cdn.shopify.com/s/files/1/0437/4088/9240/files/28621248607.pdf
    • https://cdn.shopify.com/s/files/1/0449/3508/6248/files/gevobuzilaburavazaruro.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/jodedumufuguzekaw.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_off0000b498.bin
2242577a39afaea1fdcc1c9d60f8a5451f825e1ef9f568209fb796a35b66f473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 5304 bytes
font_01_sfnt_off0000c674.bin
f3da71d4ec4ba11104fac389eb6d003dc527d368c501643ac6385852756aee64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 10788 bytes
font_02_sfnt_off0000eb4a.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 16164 bytes

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