Malicious PDF — malware analysis report

Static analysis result for SHA-256 c573c18ff0e3ad03…

MALICIOUS

PDF

132.3 KB Created: 2020-08-02 03:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee0478843e79ea28f437916234cf089 SHA-1: 5835f1e6c4e39643eee81ab9ca5b8ab34415913f SHA-256: c573c18ff0e3ad037a13ed48ea718c646347b9e4d0a47ae09d8abf91f09875f0
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to PDF files hosted on various domains, including a known malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. The document body contains garbled text but also includes the malicious URL, reinforcing the redirection 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.com/pify?keyword=wax+wings+gungeon
    • http://files.emeraldislerr.com/uploads/1/3/0/7/130739366/nupiriranono.pdf
    • http://files.jbclavaud.com/uploads/1/3/0/7/130776483/zapizasixaweju_medadajogaf.pdf
    • http://files.27andoak.com/uploads/1/3/0/7/130775607/db1968ab5bf67d.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/79868765843.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/43075943192.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/81107398334.pdf
    • https://cdn.shopify.com/s/files/1/0428/5333/5207/files/81181231901.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/10005199543.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/88004051865.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/wobisekufeboxoxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/91817797979.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/22400356183.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/72010158089.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/mifarusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/watch_tower_quest_osrs.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_off0001ce81.bin
36f9555dea9b64bcb75d8982b55d2d7ed9a691ad3a6202de572c7f806b508d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE81 4896 bytes
font_01_sfnt_off0001df64.bin
2d4b6fbe125b80318e1a51f488f7756d09636015b989fbeff6d2ef454a711bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF64 10844 bytes