Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c5a3ce43516236…

MALICIOUS

PDF

48.5 KB Created: 2020-08-27 20:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa30d93e8b391baddd4cec191a9227f SHA-1: 9387401eec5b44188d29f0d4d5077e73bd591749 SHA-256: 69c5a3ce43516236cde0fc739850e16af712fe1b7fa530f58374a6c676b11be3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO spam tactic. One of the primary links, however, redirects to a known malicious domain, indicating a phishing or malware distribution attempt. 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.me/pify?keyword=matepracticas+3+grado+montenegro+res
    • http://folefopu.lakemeridiantri.com/uploads/1/3/2/6/132695399/0c4fdd2e300f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/nda_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0812/9185/files/bevugafaraxibato.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5735/files/75175717307.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5840/files/national_anthem_usa_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/labefezenorowawozutekemuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/business_model_generation_franais.pdf
    • https://cdn.shopify.com/s/files/1/0434/0835/9589/files/wesixuwoketagolub.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/mebodasugedokipopexozuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/75830486890.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/47748131713.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/41380294769.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_off000072b4.bin
f23c0c0a6bc97c20495b1b51a51bcb06b9ad59053eaf97519f67dac48caab7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 5528 bytes
font_01_sfnt_off00008564.bin
db578ff6d1f1c5b2b2e5bf7aaecf45ca388f1e2866f2b751665e1014aac464d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8564 15824 bytes