Malicious PDF — malware analysis report

Static analysis result for SHA-256 440722b3b1da7a3e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 07:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed27566cd7f9e6795ebc870382c6c34 SHA-1: fd7966b58b5ab4e86755df042d56e8e7af708e2f SHA-256: 440722b3b1da7a3e9c6ff545d1136f09988b57ce917283f2e24f051645dfb3b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user through a link farm, likely for SEO poisoning or to deliver a malicious payload. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=manjaro+architect+guide
    • http://mawizevon.prrms.com/uploads/1/3/1/1/131164250/xenidutibaseboz.pdf
    • http://files.shopfiorina.com/uploads/1/3/1/3/131380126/jawisezoj.pdf
    • http://pabigujam.timgriffiths3d.com/uploads/1/3/1/0/131070146/wopudalowuziv-tofaruko-nofiderojujoj-jumirix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/duxozinabove.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/pevekanukulafifatetidagaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/sudasaratexunilukeduto.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/promissory_note_to_pay_off_debt_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/0697/6422/files/xowatosifarit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/89373949377.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/63348330923.pdf
    • https://cdn.shopify.com/s/files/1/0457/5651/4460/files/sql_database_schema_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/744840742.pdf
    • https://cdn.shopify.com/s/files/1/0432/0686/9147/files/62185254429.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/xowekaguvawit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/32522988119.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/1899285364.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/56406811938.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b8.bin
0d50ba74791ffe8bcf3287614db4a1cc41bfd87b4efe0b62ef58e5e6e4b1a9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 5072 bytes
font_01_sfnt_off000078f8.bin
5e0055913e50542ad473b29fef691c8673bfaae5eb7c06fb7de468e0284efba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F8 10380 bytes

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