Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6d6b7fb256b2c4…

MALICIOUS

PDF

34.4 KB Created: 2020-08-17 02:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2287040a3501a62373c61316f83bd76f SHA-1: fa7ac81bd9328c0d51fae0a6c7122fb70300b151 SHA-256: dd6d6b7fb256b2c412b02722cf3e6f861482f96d7c4b18f0568f3b5c9905acaf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=ethyl+chloroformate+msds+science+lab'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the intent to redirect users to potentially harmful content.

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=ethyl+chloroformate+msds+science+lab
    • http://files.newagevalue.com/uploads/1/3/2/7/132740541/2603996.pdf
    • http://files.woolandmen.com/uploads/1/3/0/8/130874298/durudifesije-gewoxudamilifu-tugizazuzofefan.pdf
    • http://files.mscortes.com/uploads/1/3/1/8/131856039/2151bd6.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/29330305433.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/employer_character_reference_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/lifotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0436/8780/5081/files/clep_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/dd_form_2527.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/fimojasuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/51191469754.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8077/files/94565635393.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5252/files/salitinuzajaburofamekemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/bilang_pada_tuhanmu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/bennett_mechanical_comprehension_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/repefumidesibawij.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_off0000485c.bin
d15fb008dfc9c1807dc2bf395d786bd78522b5040c5a4a0639cd411898a5e191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x485C 5460 bytes
font_01_sfnt_off00005ac9.bin
bf747622fd376553aa2ebccbe71942e9b922135060759b833736bd48063a6665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 9976 bytes

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