Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d6109045e63bff…

MALICIOUS

PDF

53.9 KB Created: 2020-08-07 22:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 486761d43c185864690d0acd10f3dd69 SHA-1: caf25c3c642c4c5f91bfa87279937bd7ae219538 SHA-256: 87d6109045e63bffb17e0355ba6a75f8d0c9416c062fe1dfee0e1a218b1a8771
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 a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for sheet music, which is then redirected via a malicious domain. This suggests a phishing or malware distribution attempt.

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=pirates+of+the+caribbean+easy+sheet+music+pdf
    • http://giwixukaj.thebromptonman.com/uploads/1/3/0/7/130739783/65977.pdf
    • http://files.chandao.co.uk/uploads/1/3/1/8/131872055/426918.pdf
    • http://nimawi.acbees.org/uploads/1/3/1/3/131379894/b3bb27ec.pdf
    • http://files.sailingcruisingscotland.com/uploads/1/3/0/7/130740589/zipakebarujukebet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/84321733530.pdf
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/automotive_service_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/81114519825.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/weekly_budgeting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/kuxuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/breaking_dawn_part_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/rurububegufer.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/84478318978.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/37408167043.pdf
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/rufafeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/architecture_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/linifogudavosebaduxezak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9993/1295/files/bunavumenuzabimerakemawi.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_off00007f97.bin
24b446cc3eeb32f70680f80242259d254809a8c4a48da772736985c3b506d1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 4540 bytes
font_01_sfnt_off00008f53.bin
4db0cc3fef9a2e32dafdc7af5fe6814c287a6820c6f83cedb526aa1724d447f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F53 5604 bytes
font_02_sfnt_off0000a234.bin
8d6e16add56a9fded7258da053927fadaa8c354f9e26696d0dfdaeb48cb3a8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA234 11956 bytes

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