Malicious PDF — malware analysis report

Static analysis result for SHA-256 16864ed2e1e31f52…

MALICIOUS

PDF

37.1 KB Created: 2020-08-17 09:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c358b63e145173568c8d5e0e8240d7c SHA-1: d8209f88d39b6350a1c43f017b2a76bf86afd761 SHA-256: 16864ed2e1e31f52ed1e1e2aa07b85babbf5c6df21fff35f86f38f17a70f44b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to this URL and a large number of other PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

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=gerudo+valley+sheet+music+cello
    • http://batixuga.memorialelementarypto.com/uploads/1/3/0/9/130969656/06dfcff8ffa6ac6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/79296207473.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/gapakabosivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/vowels_sounds_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/speech_banana_asha.pdf
    • https://cdn.shopify.com/s/files/1/0445/7739/0756/files/mulopofaginapemupopesid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/lenovikepaxaluwibuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/befexazubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/32789556512.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/90844536026.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9462/files/emotional_and_behavioral_disorders_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/barbarian_assault_guide_osrs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/fizen.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/attention_song_lyrics_download.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044c5.bin
573c90192786967bd5ab7771a6701c4a2f4712d75b0594962d765dd9971e111e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44C5 4248 bytes
font_01_sfnt_off000053a5.bin
7db7518f34f14d290e8867ad857e07b3b91cef29e1f2f26693315a16719662ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A5 5372 bytes
font_02_sfnt_off000065ce.bin
806fe9a9adc47161c70416dc05db007fdf2033fd3f76764b2f453d0190243cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 9744 bytes

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