Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8240a523d547874…

MALICIOUS

PDF

35.7 KB Created: 2020-07-31 21:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deeee216047e876026feb976187a95c7 SHA-1: 1349c4503ef8127392af38017f4bc32089c04615 SHA-256: f8240a523d547874e7522d127ec397f27d0949a12cb537e6d56c629d31aab528
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to manipulate search engine results, likely to lure victims. The primary malicious URL identified is https://ttraff.cc/pify?keyword=brinkmann+electric+smoker+manual+pdf, which is a known redirector. The document body itself is largely unreadable binary data, but the presence of the URL and the heuristics strongly suggest 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=brinkmann+electric+smoker+manual+pdf
    • http://files.curtsleague.com/uploads/1/3/0/7/130740097/dugax-bivegu-vesit-gaviserile.pdf
    • http://files.chiefengineering.us/uploads/1/3/1/3/131398129/00a947bf8ba79.pdf
    • http://files.sfandalusians.com/uploads/1/3/0/8/130874382/lubiranuj.pdf
    • http://files.thewordwasmadeflesh.org/uploads/1/3/0/7/130739918/de1512a47550a.pdf
    • http://files.juicybeetlegames.com.au/uploads/1/3/1/4/131452904/9931981.pdf
    • https://cdn.shopify.com/s/files/1/0431/6525/3792/files/gakofekoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/1334164548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/lumologazesatidodave.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/74711609752.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6119/files/welupilurexesekevofige.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/95237716352.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/dipazutuxadokijekupixilub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/tukosepaxim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/mobaxivojogosafarev.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_off00004e3f.bin
d8e64c6da17251e4d8c4674ab0b413e1f5c9fc1b00abf3aa7ec2ccdcad9dad93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3F 5416 bytes
font_01_sfnt_off00006093.bin
c3d976f1e0f656f20fbe762f4e0a0b6b24fbfeb5b1563788b63a14c3d8eb5342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 9736 bytes

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