Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67e1b476c4348b…

MALICIOUS

PDF

57.2 KB Created: 2020-08-24 19:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d089c1c0dc71a47e1f5dc6dda2e663d2 SHA-1: ac0eb63d801622a5c63e43a24322a21a0347f18c SHA-256: 6f67e1b476c4348b5b2224a5812ea83fc73c903ac1b76ad8b2ffad8c3e51a326
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=buckingham+theorem+pdf', indicating a likely attempt to direct users to malicious sites under the guise of academic content. 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.cc/pify?keyword=buckingham+theorem+pdf
    • http://files.scireinke.com/uploads/1/3/1/4/131453989/026683946e.pdf
    • http://rubozu.victorygamers.org/uploads/1/3/1/4/131406436/1087045.pdf
    • http://dovotum.ncaircompressors.com/uploads/1/3/1/4/131407181/zavejupafupi_ranipuduwiwer_xepebubik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2497/1936/files/31754037047.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/nefawibanexosazusopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lajuvifubukakevo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/juguwexibetojedod.pdf
    • https://cdn.shopify.com/s/files/1/0438/8634/6408/files/vesejoxidaxowasiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2643/files/dmsa_renal_scan_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/kuzokirofitawakarafiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/2852/6742/files/ims_advanced_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/wazuzerapavofebodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/47891940945.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/reflexive_banach_space.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008afa.bin
734c09390ced7b2262dc420a7499da4a553ccd77c73f798443308f4d402f20ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFA 5472 bytes
font_01_sfnt_off00009d68.bin
974985d5ed7a1c83cd290c5590f2119ff31c94fa08f25b2b8365e70d3e283f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D68 10908 bytes
font_02_sfnt_off0000c2ab.bin
63dd88a80e10430f79302dbe00d75f9e9d920251693d6bae18f5711e4c3eda3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 16136 bytes

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