Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d433515c454f704…

MALICIOUS

PDF

46.5 KB Created: 2020-08-15 00:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef70bab6f84e5eadf20f9c559345e44c SHA-1: f47844c9d08140bbda6da293646a128e1160cf43 SHA-256: 0d433515c454f70443e9f460e6ac2b2cdfed30c7a7272a5f458a84ffa2797fd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to a URL shortener. This redirector leads to a large collection of PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lure users to potentially harmful content.

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=landforms+of+fluvial+erosion
    • http://narulux.lifeistooshortnottobeirie.com/uploads/1/3/1/4/131437812/xubekaxuse.pdf
    • http://files.deserthillsdrive.com/uploads/1/3/0/8/130874205/nujefisof_vewabitep_womebisexaka.pdf
    • http://files.comedianambrosejones.com/uploads/1/3/1/8/131872054/09913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/93338773852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/38434214002.pdf
    • https://cdn.shopify.com/s/files/1/0452/4271/2221/files/factors_affecting_academic_performance_of_working_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/erythromycin_ophthalmic_ointment_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/58438316105.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/sokojurukagobesozedilorof.pdf
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/5443465856.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/bafg_antrag_nrw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1557/files/maxusurudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/gisefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/gidabumusosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/nuwojozubuterusakujaku.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_off000079a2.bin
a28b5e74a940d1975a2b04bcbee512c76bc926b6ebf221815ba8f96a5a5b3977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 5056 bytes
font_01_sfnt_off00008ac3.bin
61fe114e212a60bfa1d3d3de5ec017d0c4ca3b5f65d843a9444b5902eeaae480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC3 10052 bytes

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