Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5619c4829c1a2a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-08 04:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f533514999cf802035567250941811a5 SHA-1: e62b30202f63d74a1c0c578be033bbd28332c0ca SHA-256: 5d5619c4829c1a2a07289cac0de4c2ef046df2727ff80fd801128cbe20d927b1
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/pify?keyword=genetics+and+evolution+book+pdf'. The document body also contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=genetics+and+evolution+book+pdf
    • http://files.rcknteachn.com/uploads/1/3/2/6/132681576/segewalotivug.pdf
    • http://kenizeni.graysondel.com/uploads/1/3/2/3/132302921/jipunedugura_faxolun.pdf
    • http://files.historylessonsforthemoderninvestor.com/uploads/1/3/2/7/132741556/xudob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/98662248449.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/somagozaradinibatoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/23394910362.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/vaveleninorexef.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/glencoe_advanced_mathematical_concepts_precalculus_with_applications_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/14194580389.pdf
    • https://cdn.shopify.com/s/files/1/0433/2994/5758/files/xabarinajozop.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/xumirewomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0446/9538/8313/files/tutorial_autocad_electrical_2020_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3216/7068/files/50227505731.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_off0000550b.bin
47a88e30575c7b96cd46c3761b5adadf23c6db6ff082c3e8161a4f838d26d82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550B 5348 bytes
font_01_sfnt_off0000675d.bin
b9bbdb551c0d43f5785d49fc9c0d1809a7de649cddfe006ea4c2bc30ca67941d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675D 10152 bytes

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