Malicious PDF — malware analysis report

Static analysis result for SHA-256 547f6a54b0796613…

MALICIOUS

PDF

50.4 KB Created: 2020-08-17 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b8c3677ab5b8d45b46a12f4409e70b SHA-1: b82bdab27c31503291b2a69fb6271d02e4da0f3b SHA-256: 547f6a54b079661390b548aa8d3f80625f6c2141f32eecae767fb0f20b0cf456
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 ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to SEO-optimized PDFs hosted on platforms like Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded document body contains the malicious URL and several other PDF links, suggesting a lure to external, potentially malicious, 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=axios+post+request+format
    • http://files.punuka.ca/uploads/1/3/1/4/131483343/1b13a636f.pdf
    • http://xukepe.gcndesign.com/uploads/1/3/1/4/131437779/vegotolafasidopojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/crsu_date_sheet_b._ed_2nd_year.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/cardcaptor_sakura_tarot_cards.pdf
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/rojevunedeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/curriculum_vitae_samples_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/tratamiento_para_retinopatia_diabetica.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/nota_van_toelichting_bouwbesluit_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5514/files/zodufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/larogomapap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/37167627909.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/adventure_capitalist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/tamasha_movie_online_watch_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/92069246358.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7308/files/video_call_record.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_off00006503.bin
0b14297feb4468ac0b25d59e419b390e3654a42bdb4b6f1bdc6f7a1896251dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 7404 bytes
font_01_sfnt_off00007de5.bin
7726ad56e83a16798c4e731cb67c979ad03636459fac2f92a08207f182541dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE5 5200 bytes
font_02_sfnt_off00008f8a.bin
11f060f2277ab1b2b66ed3993b514789a7d55f40c6895b4db76518857b815c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8A 14228 bytes

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