Malicious PDF — malware analysis report

Static analysis result for SHA-256 0255298830f1f570…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 01:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced7221acf9d4197a6a8837fb81fa0f2 SHA-1: 366e33e5d184452b4ef3608a89ca0955968dfe4a SHA-256: 0255298830f1f5709ccf42bc2edbd037c596e17b3b4e724040d7da81cc0bee0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary link leads to 'ttraff.ru', which is flagged as malicious. The document's content, including the title "Piano music notes for beginners pdf", is likely a lure to encourage users to click on these links, potentially leading to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=piano+music+notes+for+beginners+pdf
    • http://files.christineyared.com/uploads/1/3/1/1/131163617/7431910.pdf
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/31816577606.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/27168117802.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/cara_kerja_antasida.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1148/files/diagnosis_of_type_2_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/theories_in_sociology_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0433/4010/3845/files/brian_aldiss_supertoys_last_all_summer_long.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/18565612450.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/75801261697.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/75472915319.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/79744373663.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/domadenulowuboloko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/33200582126.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f45.bin
e39c36b7adaf686059471601d2698fb5f2ec8d49be238b3c4be055e8c5eda92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 5584 bytes
font_01_sfnt_off0000721d.bin
0e07479bb85fa5a26d93b6c0d020db2d19bfd6a2986f0e81ab11405d2b524493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 10132 bytes

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