Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6871f34acae2d6d…

MALICIOUS

PDF

39.0 KB Created: 2020-08-03 11:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7d636d9cbb37691b46748b167c93e44 SHA-1: bb870bddd1c75f8171997dbbc08bdb5c6157d5d2 SHA-256: d6871f34acae2d6d73459f657469057748e5ac68a708954e0b95a70c44f8d53e
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=hey+there+delilah+tabs+pdf, which is part of a larger set of links pointing to various domains, many hosted on Shopify. This suggests a campaign using a large number of PDFs to distribute malicious links.

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.ru/pify?keyword=hey+there+delilah+tabs+pdf
    • http://files.blueacesbakeshoppe.com/uploads/1/3/1/8/131856129/7135b141.pdf
    • http://files.yoursalwayspdx.com/uploads/1/3/1/3/131384113/2576776.pdf
    • http://files.greenhillsrec.com/uploads/1/3/0/7/130739376/1516748.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/vusemonobupegupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/order_and_chaos_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/46207630984.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/10644850972.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/41981406388.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/xukunobijigosovud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/ralasorijonafusulipijok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/fagobaniniveb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6119/files/sowup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/sewinojol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/22938254542.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/
    • https://cdn.shopify.com/s/files/1/0430/4571/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f73.bin
1db481273b0a2267a62062f628e32276face1a1424dc72482cc8149c50384f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F73 4904 bytes
font_01_sfnt_off00006028.bin
9f7db5589d627e7a3806a810e29b8e6297db2c39d8fa7829af5d1270fdf4dfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6028 9548 bytes
font_02_sfnt_off000080d1.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D1 4324 bytes

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