Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8010030105caff…

MALICIOUS

PDF

49.7 KB Created: 2020-08-23 22:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b0cfa7a8c67365d4117546b834e2af SHA-1: afdae9ca226e7b80932ec99b8197fa9bff4cdf3a SHA-256: 7f8010030105caffd12bd3fb10208c0ebd50ed53d6375ad9b23db500c8376094
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a tactic of directing users to external, potentially harmful, websites, possibly for SEO spam or phishing.

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.com/pify?keyword=bass+i+love+you+music
    • http://files.kabafitafund.org.uk/uploads/1/3/1/4/131453539/baguvuvuwozovo_kitilukino.pdf
    • http://files.rockinghorsenurserygodalming.co.uk/uploads/1/3/0/8/130874160/9574641.pdf
    • http://files.ebcmasonry.com/uploads/1/3/1/4/131406140/3842024.pdf
    • http://files.delrayvillasplat2.com/uploads/1/3/1/3/131383664/sigagusegadaze_libijomuxufogik.pdf
    • http://files.k9compass.com/uploads/1/3/1/4/131453724/9962875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/91555254324.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/xetixefixagarosed.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/navair_publications.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/two_way_street_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/delikaxibagam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/xelotovevigofutoda.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/ideal_gas_law_equation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/44020491083.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/zabarefafumiwatuwewam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/third_conditional_perfect_english.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000643e.bin
f7cc844a0d1891f5ce6f0d9b248f9d9962d846d8721f03b152108d9b544f84fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5060 bytes
font_01_sfnt_off00007564.bin
d13b1e4a8bf8c3ce5ed9e86756bcfe0d7e9578863a7bdc193808abb4e1cba6d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 2336 bytes
font_02_sfnt_off00007fd7.bin
1345ccfc2c6932482df3711c7f12774b74ee1e87f2077d2e8f86469ac6384370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD7 10640 bytes
font_03_sfnt_off0000a437.bin
757ad9ffa3d596fb66763c2a242ad5168e842ae1107dbaa16f904d2b0d22b68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA437 16192 bytes

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