Malicious PDF — malware analysis report

Static analysis result for SHA-256 144b7a8ced6dcb66…

MALICIOUS

PDF

46.5 KB Created: 2020-08-20 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd746d6773706973a5445965bf81b32b SHA-1: 05178d7afb4d0affbf77eef87c14c251f8ceedf4 SHA-256: 144b7a8ced6dcb66e57fbdfa91aa869bbd5266f91378caef8bcdac4afa496f12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'va boating license test answers' and a URL that appears to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. 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=va+boating+license+test+answers
    • http://josatovov.bathbombbootcamp.com/uploads/1/3/1/3/131379894/15ff737cc4b947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/beginners_guitar_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/68590787320.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/pavilelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitomomuwarusubewikujo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1005/6615/files/asme_b31_1_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/14651648607.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/spotify_equalizer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/skyward_sword_iso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/noxalolitufefapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/sinowurefepizokenusemupas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a2a.bin
1511ac1d95007ec54610a0d156fc7ed928a8d37d0752aa8ceaeac118b18b79be
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2A 4952 bytes
font_01_sfnt_off00007b15.bin
9b6968bc00f5038fd0be6894e4558829bb5ebf1e81d9e733d7bef2e7f2f69a61
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B15 10732 bytes
font_02_sfnt_off00009f4e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4E 4324 bytes