Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d898e74dfb31db9…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 17:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f87c9b1b9bbcb48840752d630c31f64 SHA-1: 8e4e474704b45f3d895678ad40b07a9b15777faf SHA-256: 5d898e74dfb31db931ad28bc627eb45221204ebffede9cf75242f147ca5abc50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many of which are hosted on compromised or suspicious domains, and one critical link points to a known malicious redirector. The document body text, though partially corrupted, includes the URL that leads to the malicious redirector, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=understanding+public+policy+15th+edition+pdf
    • http://files.meldesignworks.com/uploads/1/3/1/3/131379223/zawefewuxurute-lamegux.pdf
    • http://files.krutschworks.com/uploads/1/3/2/6/132681325/7908049.pdf
    • http://files.mrsherrow.com/uploads/1/3/1/4/131437878/majolowasibem-tudakavep.pdf
    • http://files.mygoldenscholars.com/uploads/1/3/1/6/131637255/ruridikuxob.pdf
    • http://files.naturegreenleafllc.com/uploads/1/3/1/4/131453429/948462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/xevutelewanilobirojew.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4172/files/85287421622.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/9781050597.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/77768562623.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/gezatogaxuvoget.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/lenomijomalatofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/fuzzy_lookup_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/vizolapeponalamawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/vaxafuvofogirabik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0377/1041/files/mupisajazo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/61713886659.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/30894591412.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/fosesexelamodelinu.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_off0000606a.bin
f8230da3ceb8d49dbc20f9ac9e5d87e5f8c5dcc828f015bac13fb239f57ad057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606A 5828 bytes
font_01_sfnt_off00007446.bin
fe2daa4186b4c67f20f1bfebf2682b4dfeffa8a5d3fc5151cbe91a56a10f2380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7446 10004 bytes

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