Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d334be3787d222…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 13:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a113ce0e9ed456276d364325f90e5c SHA-1: 9a64b6393962aaa4a1d19027f700f3c487701239 SHA-256: 78d334be3787d222aeec16dd03c719f5274b834be4b397a34957ca2dae3dfa3e
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that masquerades as a free textbook download, aiming to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=zoology+textbook+pdf+free+download
    • http://files.marylouromneyart.com/uploads/1/3/1/1/131164097/21338090.pdf
    • http://jumoxu.allthingsnewvizslas.com/uploads/1/3/1/4/131483200/pewededobajugufepo.pdf
    • http://files.dignityandgrace.com/uploads/1/3/0/7/130775431/xisukujetupok.pdf
    • http://files.rangakvernberg.com/uploads/1/3/1/0/131070859/6877811.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/41083303090.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/caracteristicas_de_los_alcanos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/85498917952.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/b2b_marketing_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/odt_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/administrateur_civil.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/skyrim_kahvozein_s_fang.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/7843304173.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/pelewupusutewelukazikuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/89813693006.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_off0000668d.bin
ee381712312b9b46703c46b53cc18e64b8da886912d793b32818f434a662d11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668D 5456 bytes
font_01_sfnt_off0000794f.bin
384344c9fb26b10809b563eb7b22c336d05a42ed033257e8b447262030b1f4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794F 13068 bytes

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